Question

In a shell game there are five shells on a table. Under the shells, there are three different colored markers. One is worth $20, one worth $5, and the last is worth $2. The player will pay $5 to make one pick. What is the expected value?

A $.3

B $.5

C $.4

D $-.4

E $5.4

F None of the Above

The number of problems a student will miss on a take home exam is matched with the probability.

Number of exam attempts    X	1	2	3	4
Probability   P(X)	0.5	0.3	0.1	0.1

What is the mean number of problem that a student will miss?

A 1.2

B 2.3

C 1.8

D None of the above

The number of problems a student will miss on a take home exam is matched with the probability.

Number of exam attempts    X	1	2	3	4
Probability   P(X)	0.5	0.3	0.1	0.1

What is the standard deviation of the above data?

.2

A .96

B .98

C 1.8

D None of the above

A student takes a 15 question multiple choice statistics exam with 5 choices for each question. If the student guesses at random on each question, what is the probability that the student gets 10 or less questions correct?

.99999

A .00001

B .25

C .0001

D None of the above

Answer 1