Question 1117874
W is normally distributed with mean 1.5 and standard deviation 0.4
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Z is the standard normal random variable, this implies that the mean of Z is 0 and its standard deviation is 1
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z-score(W) = (0.5 - 1.5)/0.4 = -2.5 and Pr(W<0.5) = 0.0062
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z-score(Z) = (a - 0)/1 = -2.5 since Pr(W<0.5) = Pr(Z < a) and a = -2.5
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