(Choose 1 answer)
(See picture)
A. 31.74%
B. 4.55%
C. 95.45%
D. 68.26%
E. None of the other choices is correct
The lifetimes of light bulbs of a particular type are normally distributed with a mean of 360 hours and a standard deviation of 5 hours. What percentage of the bulbs have lifetimes that lies within 1 standard deviation of the mean? i.e. find P(μ - σ<X<μ +σ) = ?
Let P(Z<1) = 0.8413, P(Z<-1)=0.1587,P(Z-0.47)=0.3192, P(Z<0.47)=0.6808
El (11
