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?

Correct answer:

p1 =  0.1243
p2 =  0.7686
p3 =  0.2209

Step-by-step explanation:

m=90 σ=13 p1=N(m,σ,x<75) p1=0.1243

Use the normal distribution table.
p2=N(m,σ,80<x<120)  p2=0.7686

Use the normal distribution table.
p2=N(m,σ,x>100) p3=0.2209

Use the normal distribution table.



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