Use the normal distribution of SAT critical reading scores for which the mean is 502 and the standard deviation is 122. Assume the variable x is normally distributed (a) What percent of the SAT verbal scores are less than 650? (b) If 1000 SAT verbal scores are randomly selected, about how many would you expect to be greater than 550? Click to view page 1 of the standard normal table Click to view page 2 of the standard normal table. (a) Approximately % of the SAT verbal scores are less than 650. (Round to two decimal places as needed.)

Why is the standard deviation a better measurement of the spread of data than simply taking the sum of the deviations of each x value and the mean?  Briefly explain your answer in one or two sentences

Scores on the Wechsler Adult Intelligence Scale for the 20 to 34 age group are approximately normally distributed with mean 110 and standard deviation 15. How high must a person score to be in the top 6% of all scores?  Enter your answer as a whole number.

Recently, a random sample of 25-34 year olds was asked, "How much do you currently have in savings, not including retirement savings?" The data in the table represent the responses to the survey. Approximate the mean and standard deviation amount of savings. E Click the icon to view the frequency distribution for the amount of savings. The sample mean amount of savings is $ Frequency distribution of amount of savings (Round to the nearest dollar as needed.) The sample standard deviation is S (Round to the nearest dollar as needed.) Frequency Savings $0 $199 $200-$399 $400 $599 $600 $799 $800 $999 $1000-$1199 $1200 $1399 342 86 45 21 10 7 1 Print Done