The time it takes 5th graders to complete a particular mathematics problem are Normally distributed with a mean 2 minutes and a standard dev

Question

The time it takes 5th graders to complete a particular mathematics problem are Normally distributed with a mean 2 minutes and a standard deviation of 0.8 minutes.
a. Find the probability that a randomly chosen 5th grader will take more than 2.5 minutes to complete the problem.

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Hồng Cúc 3 days 2021-07-19T16:56:40+00:00 1 Answers 1 views 0

Answers ( )

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    2021-07-19T16:57:57+00:00

    Answer

    0.266

    Step-by-step explanation:

    x  ~ N(2,0.8^{2})

    P(x>2.5)

    =P(Z>\frac{2.5-2}{0.8})

    =p(z >0.625)

    =1-  
    Φ(0.625)

    = 1 – 0.734

    =0.266

    Hope this helps please make me brainliest!

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