What fraction is more than 10 units away from zero

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A vehicle driver gauges the relative speed of a preceding vehicle by the speed with which the image of the width of that vehicle varies. This speed is proportional to the speed X of variation of the angle at which the eye subtends this width. According to Ferrani and others (Transportation Research, 18A, 1984, pp. 50-51), a study of many drivers revealed X to be normally distributed with a mean of zero and a standard deviation of 10(10⁴) radians per second.

a What fraction of these measurements is more than five units away from zero?

b What fraction is more than 10 units away from zero?

Reference no: EM131197214

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