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7 August, 09:22

Find the probability a shopper, selected at random, spends less than 96 minutes at the mall. Show your work. The correct probability statement is required to get full credit. Write your final answer to 4 decimal places.

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  1. 7 August, 10:38
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    The probability a shopper, selected at random, spends less than 96 minutes at the mall is 0.9450

    Step-by-step explanation:

    Mean = xbar = 88 mins

    Standard deviation = σ = 5 mins

    To determine the probability the probability a shopper, selected at random, spends less than 96 minutes at the mall, we need to standardize 96 mins, that is, obtain its z-score.

    The standardized score is the value minus the mean then divided by the standard deviation.

    z = (x - xbar) / σ = (96 - 88) / 5 = 1.6

    To determine the probability the probability a shopper, selected at random, spends less than 96 minutes at the mall, P (x < 96) = P (z < 1.6)

    We'll use data from the normal probability table for these probabilities

    P (x < 96) = P (z < 1.6) = 1 - P (z ≥ 1.6) = 1 - P (z ≤ - 1.6) = 1 - 0.055 = 0.9450

    The probability a shopper, selected at random, spends less than 96 minutes at the mall is 0.9450
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