IB Stats/Probability Review (ch 16-17)

Question 1

Find the value of discrete variable k.

Accepted Answer

2/10, 1/5

Question 2

How do you find the IQR?

Accepted Answer

Q3-Q1

Question 3

A normal 6-sided die is thrown 24 times and the number of 6's is recorded. Find expected value.

Accepted Answer

4

Question 4

Class= 60 girls and 40 boys :P(left handed)= .18, P(girl and left handed)=.1 ,Find P(boy and right handed)

Accepted Answer

.320

Question 5

If P(A) = 0.2, P(A ∩ B) = 0.1, and P(A u B) = 0.7, find P(B')

Accepted Answer

0.4

Question 6

Find the probability that a student took Math HL

Accepted Answer

0.25

Question 7

A bag has 100 sweets, 35 are cherry. Two are picked. Probability that at least one is cherry?

Accepted Answer

0.580

Question 8

n=25 students, 18 take chemistry and 12 take physics. 3 students take neither chemistry nor physics. Find S.

Accepted Answer

3

Question 9

Find the probability of finding exactly 7 tails.

Accepted Answer

0.0118

Question 10

Find the probability that this person is a smoker or is male.

Accepted Answer

0.65

Question 11

A class contains 60 girls. What is the probability of randomly selecting a boy from the class?

Accepted Answer

.400

Question 12

Find the probability that a selected student is taking both Math Studies and Spanish:

Accepted Answer

0.075

Question 13

What is the equation for the probability addition rule?

Accepted Answer

P( A or B)= P(A) + P(B) - P(A and B)

Question 14

Find the probability that this person is male given that they are a smoker.

Accepted Answer

0.667

Question 15

A die is rolled 4 times, what is the probability of getting exactly 2 fives?

Accepted Answer

.116

Question 16

Find the probability that a student studied both french and math HL.

Accepted Answer

0.05

Question 17

What is the standard deviation formula(population)?

Accepted Answer

∂ = √∑(x-𝒙)2/n

Question 18

There are 52 cards in a deck. Find the probability of randomly drawing 4 aces in a row.

Accepted Answer

.079

Question 19

Find the standard deviation of this data set.

Accepted Answer

4.06

Question 20

What does the correlation coefficient show?

Accepted Answer

a measure that determines the degree to which the movement of x and y

Question 21

For Independent events, find the P(A n B) if the P(A)= 0.3 and P(B) = 0.2

Accepted Answer

P(A n B) = 0.06

Question 22

Find the probability that someone is a smoker.

Accepted Answer

0.45

Question 23

Find P(Bart') [(P(A n B)')]

Accepted Answer

0.4

Question 24

Find the IQR of this data set: Q1 = 12, Q2=20, Q3 = 31, Q4 =40

Accepted Answer

19

Question 25

Find the expected value.

Accepted Answer

11.3

IB Stats/Probability Review (ch 16-17)

Questions 25

IB Stats/Probability Review (ch 16-17)

Questions 25