Probability and statistics

Question 1

The mean of 8, 10 and x is the same as the mean of 6, 8, 10 and 12. Find the value of x.

Accepted Answer

9

Question 2

For the set of scores 30, 50, 60, 30, 70, what is the difference between the mean and the mode?

Accepted Answer

18

Question 3

In a simultaneous toss of two coins, find the probability of throwing two tails.

Accepted Answer

1/4

Question 4

For the set of scores 8, 9, 12, 7, 9, 11, 8, 9, 5, 13, 7, 9 find the range.

Accepted Answer

8

Question 5

2 eggs chosen from a carton of 3 brown and 9 white. What's the probability that both are brown?

Accepted Answer

1/22

Question 6

Find the probability of throwing two heads when three coins are tossed at the same time.

Accepted Answer

3/8

Question 7

2 cards drawn from a normal pack (with replacement). Find the probability that both are aces.

Accepted Answer

1/169

Question 8

In a single throw of two dice, find the probability of totaling 8 or 11.

Accepted Answer

7/36

Question 9

Two dice are thrown. Find the probability that the sum is less than 5.

Accepted Answer

1/6

Question 10

From the set of scores 3, 1, 4, 6, 5, 5, 7, 3, 4, 5, 4, 5, 7 the mode is ...

Accepted Answer

5

Questions 10