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In any given year, the probability of an earthquake greater than Magnitude $6$ occurring in the Garhwal Himalayas is $0.04$. The average time between successive occurrences of such earthquakes is ____ years.
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Probability of an earthquake greater than magnitude $6$ is $0.04.$

This means $4$ out of $100$ years will face an earthquake greater than magnitude $6.$ So average time between successive earthquakes will be $100/4=25$ years.
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Probability of earthquake greater than 6 in a given year=0.04

Average time between two successive earthquakes=when the probability of earthquake becomes 1

i.e 1/(0.04)=25 years
Answer:

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