The sample mean for a recent introductory psychology test was 78 ...

[OSWALD]

The sample mean for a recent introductory psychology test was 78 and the sample variance was 9 . Approximately what proportion of the scores was above 81?
 
  a. 0.50 c. 0.16
  b. 0.68 d. 0.34

Question 2

Using the appropriate values from the z-table in the textbook appendix, find the z-score for which the area beyond z in the tail is 0.2546.
 
  a. 0.66 c. 0.66
  b. 0.2454 d. 0.2454

[millet]

Answer to Question 1

C

Answer to Question 2

A

[OSWALD]

Gracias!

[deja]

Thanks for the timely response, appreciate it