According to a college survey, 22% of all students work full time. find the standard deviation for the random variable x, the number of students who work full time in samples of size 16. round your answer to two decimal places.
a. 4.26
b. 0.22
c. 2.75
d. 3.52
e. 4.00

What is the probability of drawing three queens from a standard deck of cards, given that the first card drawn was a queen? assume that the cards are not replaced.

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.

Afamily went out to dinner and their bill was $113.if they want to leave a 19% tip, how much should they leave.