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For a normal distribution what z-score value separates the lowest 10 percent of the scores from the rest of the distribution?

-1.28


What z-score value separates the highest 10 of the scores in a normal distribution from the lowest 90?

It is 1.281551


What z-score value separates the highest 40 percent of the scores from the rest of the distribution?

0.2533


What z-score for the upper 50 percent of area under the normal curve?

A Z-Score of 0 separates the upper 50% of the area from the lower 50% of the area. A Z-Score of 0 is at the mean, median, and mode of the distribution.


What z-score separates the top 10 percent from the rest of the scores?

z = 1.281551


What are the z score boundaries for the middle of 50 percent of the distribution?

It is -0.6745 to 0.6745


What are the z score boundaries for the middle 60 percent of the distribution?

The boundaries are ± 0.8416


The standard z-score such that 80 percent of the distribution is below to the left of this value is?

z = 0.8416


In a standard normal distribution about percent of the scores fall above a z-score of 3.00?

0.13


What is the probability that a data value in a normal distribution is between a z-score of -1.98 and a z-score of 1.11 Round your answer to the nearest tenth of a percent?

It is 84.3%


What are the z-score boundaries for the middle of 50 percent of the distribution?

50 * * * * * z = -0.67449 to z = +0.67449


An arithmetic student needs at least a 70 percent average to receive credit for the course If she scored 86 percent 77 percent and 64 percent on the first three exams what is the lowest score she?

53 percent