Probability, Percentile, and Standard Deviation
Describe a grouped frequency distribution; Percentile and rank
July 9, 2019Calculating probability of sample proportion
July 9, 2019The IQ scores are normally distributed with a meanof 100 and a standard deviationof 15.
1. What is the probabilitythat a random person has an IQ between 85 and 115?
2. Find the 90th percentileof the IQ distribution.
3. If a random sampleof 100 people is selected, what is the standard deviation of the sample mean?
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