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The grades on a chemistry midterm at Springer are roughly symmetric with μ=67\mu = 67μ=67mu, equals, 67 and σ=2.0\sigma = 2.0σ=2.0sigma, equals, 2, point, 0. William scored 66 on the exam. Find the z-score for William's exam grade. Round to two decimal places.

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Answer: - 0.50

Step-by-step explanation:

Given the following :

Mean score = 67

Standard deviation = 2

To obtain the Zscore, use the relation:

Zscore = (X - mean) / standard deviation

Williams score = 66 = X

Hence,

Zscore = (66 - 67) / 2

Zscore = - 1 / 2

Zscore = - 0.50

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