For boys, the average number of absences in the first grade is 15 with a standard deviation of 7;
for girls, the average number of absences is 10 with a standard deviation of 6.
In a nationwide survey, suppose 100 boys a
A national achievement test is administered annually to 3rd graders. The test has
a mean score of 100 and a standard deviation of 15. If Jane's z-score is 1.20,
what was her score on the test?
A sample consists of four observations: cfw_1, 3, 5, 7. What is the standard deviation?
(E) None of the above
A card is drawn randomly from a deck of ordinary playing cards. You win $10 if the card is