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Recent questions tagged statistics
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Previous Gate
The second moment of a Poissondistributed random variable is 2. The mean of the variable is .... My question on solving we get 2 values of lamda(ie mean) .One is 2 and the other is 1 .So which one to choose?
asked
Nov 23, 2017
in
Mathematical Logic
by
Kalpataru Bose
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507
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721
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mathematics
gate2015
engineeringmathematics
statistics
probability
poissondistribution
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2
Finding minima of function.
For what value of 'k' (in terms of $X_{i}$'s) following functions will attain their minimum value $\rightarrow$ $F_{1}(k)$ = $\sum_{i=0}^{n} \left  X_{i}  k \right $ $F_{2}(k)$ = $\sum_{i=0}^{n}\left ( X_{i}  k \right )^{2}$ If possible, please provide some valid proof for supporting your answer ?
asked
Nov 11, 2017
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Probability
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Chhotu
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engineeringmathematics
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maximaminima
0
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1
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3
Doubt
the harmonic mean of two positive integers p and q is 3, given that [ (6p+1)/(7q4) ] <(p/q), what could be the value of q? a)q<=4 b)q>9 c)q<8 d)q>=13
asked
May 15, 2017
in
Numerical Ability
by
Angkit
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3.8k
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87
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statistics
+3
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2
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4
GATE2016Session2GA6
Students taking an exam are divided into two groups, P and Q such that each group has the same number of students. The performance of each of the students in a test was evaluated out of $200$ marks. It was observed that the mean of group P was $105$, ... of group Q scored marks in a narrower range than students in group P. The median of the marks of group P is $100$.
asked
Jan 20, 2017
in
Numerical Ability
by
makhdoom ghaya
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41.2k
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648
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gate2016session2aptitude
probability
statistics
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1
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5
Standard Deviation
asked
Oct 22, 2016
in
Probability
by
KISHALAY DAS
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6.6k
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413
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statistics
standarddeviation
+2
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2
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6
ISRO201474
What is the median of data if its mode is 15 and the mean is 30? 30 25 22.5 27.5
asked
Jun 27, 2016
in
Probability
by
Aryan
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817
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2.5k
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probability
statistics
meanmodemedian
isro2014
+3
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3
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7
ISRO201167
The arithmetic mean of attendance of 49 students of class A is 40% and that of 53 students of class B is 35%. Then the percentage of arithmetic mean of attendance of class A and B is 27.2% 50.25% 51.13% 37.4%
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Jun 23, 2016
in
Probability
by
jothee
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115k
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1.8k
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isro2011
statistics
numericalability
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1
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8
ISRO200965
If the mean of a normal frequency distribution of 1000 items is 25 and its standard deviation is 2.5, then its maximum ordinate is $\frac{1000}{\sqrt{2 \pi} } e^{25}$ $\frac{1000}{\sqrt{2 \pi} }$ $\frac{1000}{\sqrt{2 \pi} } e^{2.5}$ $\frac{400}{\sqrt{2 \pi} }$
asked
Jun 15, 2016
in
Probability
by
jothee
Veteran
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115k
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1.7k
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isro2009
statistics
normaldistribution
+4
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4
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9
GATE2014EC01GA4
The statistics of runs scored in a series by four batsmen are provided in the following table. Who is the most consistent batsman of these four? Batsman Average Standard deviation $K$ $31.2$ $5.21$ $L$ $46.0$ $6.35$ $M$ $54.4$ $6.22$ $N$ $17.9$ $5.90$ $K$ $L$ $M$ $N$
asked
Mar 18, 2016
in
Numerical Ability
by
makhdoom ghaya
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41.2k
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1.3k
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gate2014ec01
statistics
variance
numericalability
+2
votes
2
answers
10
GATE2012AE5
The arithmetic mean of five different natural numbers is $12$. The largest possible value among the numbers is $12$ $40$ $50$ $60$
asked
Feb 16, 2016
in
Numerical Ability
by
Akash Kanase
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43.6k
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366
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gate2012ae
statistics
numericalability
+1
vote
1
answer
11
Distribution (mean mode median)
what is positively skewed ,symmetric and negatively skewed distribution?
asked
Dec 25, 2015
in
Probability
by
Amey
(
157
points)

411
views
statistics
mode
median
distribution
+4
votes
0
answers
12
TIFR2015A15
Let $A$ and $B$ be nonempty disjoint sets of real numbers. Suppose that the average of the numbers in the first set is $\mu_{A}$ and the average of the numbers in the second set is $\mu_{B}$; let the corresponding variances be $v_{A}$ and $v_{B}$ ... $p.v_{A}+ (1  p). v_{B} + (\mu_{A} \mu_{B})^{2}$
asked
Dec 5, 2015
in
Probability
by
makhdoom ghaya
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41.2k
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198
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tifr2015
statistics
+3
votes
2
answers
13
statistics
Q) Let $x$ be normal variable with mean $8$ and standard deviation $4$ then $p(X\leq5)$ is A). Greater than zero but less than $0.5$ B). Greater than $0.75$ C). Greater than $0.5$ but less than $1$ D). Equal to $0.5$
asked
Dec 3, 2015
in
Probability
by
richa116
Active
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2.1k
points)

512
views
statistics
+8
votes
2
answers
14
GATE201264
Which of the following assertions are CORRECT? P: Adding $7$ to each entry in a list adds $7$ to the mean of the list Q: Adding $7$ to each entry in a list adds $7$ to the standard deviation of the list R: Doubling each entry in a list doubles the mean of the list S: Doubling each entry in a list leaves the standard deviation of the list unchanged $P$, $Q$ $Q$, $R$ $P$, $R$ $R$, $S$
asked
Sep 29, 2014
in
Numerical Ability
by
gatecse
Boss
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18.3k
points)

1.1k
views
gate2012
numericalability
statistics
normal
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