use the normal distribution SAT critical readi Homework: Week 5 Homework 40 pts

Question

use the normal distribution SAT critical readi

Homework: Week 5 Homework 40 pts Score: 0 of 4 pts 4 of 12 (3 complete) 5.2.17 Use the normal distnbution of SAT critical reading scores for which the mean is 502 and the standard deviation is 123 Assume the variable x is normally distributed (a) What percent of the SAT verbal scores are less than 550? (b) If 1000 SAT verbal scores are randomly selected, about how many would you expect to be greater than 525? (a) Approximately L 1% of the SAT verbal scores are less than 550 Round to two decimal places as needed)

Explanation / Answer

a) P(X<550)

= P(Z<(550-502)/123)

= 65.18%

b) P(x>525)

= P(Z>(525-502)/123)

= 0.425834

= 0.4253834*1000

= 426

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