A fuel injection system is designed to last 18 years, with a standard deviation of 1.4 years. What is the probability that a fuel injection system will last less than 15 years?

25%

33%

2%

20%

Question

6 July, 04:40

+5

Answers (1)

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Sydnee Mcintyre · Answer 1

2%

Step-by-step explanation:

X ~ N (18, 1.4²)

P (X < 15)

z = (15-18) / 1.4

z = - 2.143

Using z-table:

1 - 0.9839

0.0161 * 100

1.61%

A fuel injection system is designed to last 18 years, with a standard deviation of 1.4 years. What is the probability that a fuel injection system will last less than 15 years?25%33%2%20%