The scores from a state standardized test have a mean of 80 and a standard deviation of 10. The distribution of the scores is roughly bell shaped. to find the percentage of scores that lie between 60 and 80.

Question

Mathematics

Corinne Golden

25 January, 09:38

The scores from a state standardized test have a mean of 80 and a standard deviation of 10. The distribution of the scores is roughly bell shaped. to find the percentage of scores that lie between 60 and 80.

+3

Answers (1)

Know the Answer?

Maurice Noble · Answer 1

47.5%.

Step-by-step explanation:

60 is 2 standard deviations below the mean.

According to the emperical rule, there is approximately 90% of normally distributed data within 2 standard deviations of the mean. Your interval is half of that because it is the data between the mean and two standard deviations

below the mean. therefore, the answer is 47.5%.