Probability (IB SL Analysis)

The table represents the probability of guessing correct on a 5 question true-false quiz.  Find the probability for at least 4 questions correct.

• .03125
• .15625
• .3125
• .1875

Tags

CCSS.HSF-LE.A.1C

The table above shows a television station's advertisement sales. The distribution of sales for one 24-hour day is given. Find the expected value of sales. Round to the nearest hundredth.

• 31.83

• 15.68

• 0.20

• 1.00

A stockbroker estimates that at the end of the year, there is a 40% chance a stock will be worth $50, a 35% chance it will be worth $60 and a 25% chance it will be worth $70.

What expected value does this broker assign to this stock's end-of-the-year price?

• $58.50

• $60.00

• $62.50

• $180.00

Find the missing value for P(X=5) in the probability ditribution:

Number of Toys | Probability

0| 0.03

1| 0.16

2| 0.30

3| 0.23

4| 0.17

5| ?

• 0.11

• 0.21

• 0.01

• 0.31

Tags

CCSS.7.SP.C.5

CCSS.7.SP.C.7

Laura got a bag full of colorful jelly beans. There were 30 of them: 7 orange, 5 green, 3 blue, 4 red, and 11 yellow. After shaking the bag, she randomly selected two jelly beans from the box.

What's the probability that the first one was yellow and the second one was red?

• 0.37

• 0.05

• 0.14

• 0.5

A survey was conducted by the production team of PepsiCo to determine if Malaysians prefer Coke or Pepsi. The following result table was compiled. Use 3 decimals in calculations.

If an Malaysian is selected at a random, what is the probability that the individual is male or prefers Coke?

• 0.33

• 0.79

• 0.21

• 0.95

If P(AIB)=0.40 and P(B)=0.30, find  $P\left(A\cap B\right)$  .

• 0.1

• 0.4

• 0.12

• 0.75

The probability that tomorrow will be a rainy day is 0.48. The probability tomorrow will be a windy day is 0.3. The probability that it will rain and be windy tomorrow is 0.14. What is the probability it will be windy or rainy tomorrow? (Two decimal places)

• 0.92

• 0.5

• 0.78

• 0.64

What statement does the shaded region represent?

• A U B

• B' ⋂ A

• B'

• B' U A

What is P(Foreign language | Sport)?

• 14/27

• 14/24

• 23/47

• 37/47