Question

Which of the following expressions entered into a graphing calculator will
return the probability that a data value in a normal distribution is between a z-
score of -2.33 and a z-score of 0.17?
A. normalcdf(-2.33, 0.17)
B. normalcdf(2.33, 0.17)
C. normalcdf(0.17, 2.33)
D. normalcdf(-0.17, 2.33)

Answer 1

The expression that returns the probability that a data value in a normal distribution is between a z- score of -2.33 and a z-score of 0.17 is (a) normalcdf(-2.33, 0.17)

To calculate the probability between two z-scores is to calculate the area between the z-scores.

This is done using the following syntax: normalcdf(lower bound, upper bound)

From the question, the lower and the upper z-scores are -2.33 and 0.17

So, the formula would be normalcdf(-2.33, 0.17)

Hence, the expression is (a)

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