Statistics

Question 1

Combination formula

Answer 1

nCk = n! / k!(n-k)!

Question 2

Permutation formula

Answer 2

nPk = n! / (n-k)!

Question 3

In a list with an odd number of terms arranged in ascending or descending order, the median is…

Answer 3

The middle term

Question 4

In a list with an even number of terms arranged in ascending or descending order, the median is…

Answer 4

The average of the middle two terms

Question 5

Mode

Answer 5

Term(s) that appear(s) most frequently

Question 6

Range

Answer 6

Positive difference between the largest term in the list and the smallest term

Question 7

In a sequence of consecutive or evenly spaced integers the average (mean) equals…

Answer 7

The median

Question 8

To find the number of terms in a sequence of consecutive integers…

Answer 8

Take the difference between the largest and the smallest and add 1

Question 9

Probability

Answer 9

Number of desired outcomes / number of total possible outcomes

Question 10

A coin is tossed in the air 3 times. What is the probability that the coin landed heads up exactly twice?

Answer 10

Desired outcomes = 3! / 2!1! = 3

Total outcomes = 2 x 2 x 2 = 8

Probability = 3/8