DP AI HL: Winter Break Stats Quiz

Which one of the following variables is a discrete numerical variable?

• The number of students in a class.

• The height of a person.

• The weight of a car.

• Distance between two cities.

The standard deviation of a data set is 3.7. The number 19 is subtracted from all numbers in the set.

Find the standard deviation of the new data set.

• -15.3

• 3.7

• Not enough info

In a class of 30 IB students, 20 study mathematics SL, 12 study physics and 8 study both of these subjects.

Find the probability that a randomly selected student does not study both of these subjects.

• 1/5

• 4/5

• 11/15

• 4/15

Allistair throws a biased dice. The probability of getting a 6 with this dice is 0.4. The other numbers are equally probable. What is the probability of getting a 1?

• 1/5

• 1/10

• 2/15

• 3/25

Two fair six-sided dice are thrown. What is the probability that the sum of the values on the two dice is a square number?

• 1/10

• 7/36

• 11/36

• 2/9