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6 July, 04:40

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%

+5
Answers (1)
  1. 6 July, 05:07
    0
    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%
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