if T is 1 then calculation should be e^(-1/29)

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MTBF is the mean (average) of a distribution of product life time or life between successive failures.

MTBF=(6+4+8+5+6)/5=29/5

the probability or reliability that the product will work for a defined period of time without failure is given by the following equation: R(T)=exp(-T/MTBF)

here T= 1hour

R(1)=e^(-5/29)=e^(-0.1724)=0.84

Reference: