A an electric battery for a new electric vehicle has a range that is normally distributed with an average of 400 miles and a standard deviation of 20 miles. What percent of batteries will have a range between 380 miles and 420 miles?
Added by Stacy W.
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The z-score is a measure of how many standard deviations an element is from the mean. The formula for calculating the z-score is: Z = (X - μ) / σ Where: X = value μ = mean σ = standard deviation For 380 miles: Z1 = (380 - 400) / 20 = -1 For 420 miles: Z2 Show more…
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