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SAT scores are normally distributed with a mean of 500 and a standard deviation of 100
A) What percent of test takers score less than 300?B) If 300 students took the SAT test in one high school, how many scored between 600 and 700?C) How many standard deviations from the mean is a student who earns a score of 800?D) In what percentile is Beth, who scored 640? Round to the nearest whole percentE) Approximately how many students in Beth's class of 300 do you expect got a higher score? round as appropriate
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Find the probability between the given values for normal distribution.
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An anatomy teacher hypothesizes that the final grades in her class are distributed as 10% A's, 23% B's, 45% C's, 14% D's, and 8% F's. At the end of the semester, she has the following grades.
A stockbroker at Critical Securities reported that the mean rate of return on a sample of 10 oil stocks was 12.6 percent with a standard deviation of 3.9 percent. The mean rate of return on a sample of 8 utility stocks was 10.9 percent with a stan..
Prediction interval for the regression line - Using the age and sick days data from table below, find the 98% prediction interval when x = 47 years.
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