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31 March, 20:45

Fuel economy estimates for automobilos built in a certain yoar predicted a mean of 26.8 mpg and a standard deviation of 72 mpg for highway driving. Assume that a normal distribution can be applied. Within what

range are 99.8% of the automobiles?

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  1. 31 March, 22:01
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    range=u ± 3.09 sd

    Step-by-step explanation:

    Given:

    mean, u = 26.8 mpg

    standard deviation, sd=72 mpg

    % contained in interval = 99.8%

    the interval for 99.8% of the values of a normal distribution is given by

    mean ± 3.09 standard deviation = u ± 3.09 sd

    =26.8 ± 3.09 (72)

    =26.8 ± 222.48

    = 249.28, - 195.68

    range=u ± 3.09 sd = 249.28, - 195.68!
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