Question
I developed a new anxiety inventory. I administered my inventory to 1,000 people. The scores were normally distributed (normal curve). The mean score was 80
I developed a new anxiety inventory. I administered my inventory to 1,000 people. The scores were normally distributed (normal curve). The mean score was 80 and the standard deviation was 9.
What percentage of scores were between 80 and 89?
What percentage of scores were higher than 85?
What percentage of scores were lower than 90?
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Advanced Engineering Mathematics
Authors: Erwin Kreyszig
10th edition
470458364, 470458365, 978-0470458365
