The average 7

The average lifespan for cricket is 90 days, with a standard deviation of 13 days. If we assume that the lifespan of cricket is normally distributed,
a. What is the probability a randomly selected cricket has a lifespan of fewer than 75 days?
b. What is the probability a randomly selected cricket will have a lifespan between 80 and 120 days?
c. What is the probability a randomly selected cricket will have a lifespan of more than 100 days?

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You need to know the following knowledge to solve this word math problem:

statistics

mean
standard deviation
normal distribution

combinatorics

probability

arithmetic

comparing

Grade of the word problem

high school

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