Find the probability of selecting a z score between -0.85 and 1.15

0.6772

Step-by-step explanation:

Use a z-score table.

P(-0.85 < z < 1.15) = P(z < 1.15) − P(z < -0.85)

P(-0.85 < z < 1.15) = 0.8749 − 0.1977

P(-0.85 < z < 1.15) = 0.6772

67.72% probability of selecting a z score between -0.85 and 1.15

Step-by-step explanation:

Z - score

In a set with mean and standard deviation , the zscore of a measure X is given by:

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

Find the probability of selecting a z score between -0.85 and 1.15

This is the pvalue of Z = 1.15 subtracted by the pvalue of Z = -0.85

Z = 1.15 has a pvalue of 0.8749

Z = -0.85 has a pvalue of 0.1977

0.8749 - 0.1977 = 0.6772

67.72% probability of selecting a z score between -0.85 and 1.15

the entire expression should be subtracted from 30. to subtract the quantity, distribute the negative sign, which changes the signs on the terms. so, the –2 changes to positive and gets added to 30 instead of subtracted from it.

hope this ! ^w^

step-by-step explanation:

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