phoW ot aoitel 6C The Normal Distribution 393 standard score was 75. 21-28: Psychology Exam. The scores on a psychology exam were normally distributed with a mean of 67 and a standard deviation of 8. ve, and she gave a ard score of 2 or more. 21. About what percentage of scores were above 59? co he is of median height. 22. About what percentage of scores were below 83? 23, A failing grade on the exam was anything 2 or more standard deviations below the mean. What was the cutoff for a failing score? Approximately what percentage of the students failed? ing sets of three distri- scale. Identify the two ormal distributions, which 24. If 500 students took the exam, approximately how many stu- dents scored below 75? 91008 bsbr esd 25. What is the standard score for an exam score of 67? 26. What is the standard score for an exam score of 63? 27. What is the standard score for an exam score of 55? 28. What is the standard score for an exam score of 85? IM8 29-30: Standard Scores and Percentiles. Use Table 6.3 to find the

The mean of 14 numbers in a data set is 43. A new number is included in the data set. It changes the mean to 44. What is the new number? Record the result below accurate to two decimal places.

The total blood cholesterol level was measured for each of 21 adults. Here are the 21 measurements (in mg/dL). 131, 139, 152, 161, 163, 165, 176, 181, 185, 185, 185, 189, 193, 194, 195, 206, 210, 213, 214, 233, 249 Send data to calculator Send data to Excel Frequency 10+ 6. 8. 6- 4 4 4. 2- 0--/- 200 225 250 150 Cholesterol level (in mg/dL) 125 175 2. 寸 2.

A group of 500 students take a survey about distance learning.  150 prefer distance learning.  What is the proportion of students that prefer distance learning.