millimeters. Round your answer to four decimal places

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The standard deviation is the square root of the variance. So SD = sqrt(4) = 2

Z = (137 - 136) / 2 = 1/2 = 0.5 which is 0.5 standard deviations greater than the mean

P(Z > 0.5) = 1 - 0.691 = 0.309

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