Battery lifetime is normally distributed for large samples. The mean lifetime is 500 days and the standard deviation is 61 days.

Question

Battery lifetime is normally distributed for large samples. The mean lifetime is 500 days
and the standard deviation is 61 days.
a) Find the distribution by filling in the blanks:
X~N(
)
b) Find the probability of batteries that have lifetimes longer than 561 days? Round to 4
decimals.
c) Find the probability of batteries that have lifetimes at most 497 days? Round to 4
decimals.
d) Find the 75th percentile. Round to 1 decimal.

Kunduz · Accepted Answer

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