Probability level 9

The probability of all combinations combined will equal:

(Pr of any dot combination)

• 100

• 1

• 0.05

• 10

100 people were asked to choose the best ice-cream flavour; 38 chose chocolate, 47 chose vanilla, 11 chose strawberry, and 4 chose something else. Are these mutually exclusive events?

• No: there is more than one outcome, so they can't be mutually exclusive.

• Yes: the outcomes do not cross-over with each other, so they are mutually exclusive.

• Either: You could pick any flavour you wanted

• There is not enough information to tell

What is the relative frequency that a red shape will be square

• 53%

• 33%

• 25%

• 13%

A sample space is given as indicated: {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}. The sample space for event A is {2, 5, 6, 8}. What is the complementary event?

• {2, 5, 6, 8}

• {1, 10}

• {2, 8}

• {1, 3, 4, 7, 9, 10}

A sample of a school was taken, and it showed that for every 12 people who wore a mask, 28 did not. If there are 380 students in the school, how many people would you expect to see without a mask?

• 28

• 266

• 296

• 114

There are 14 coloured counters: 3 green, 5 blue, 2 red and 4 yellow. If I was after the Pr. of both a green and a red counter with replacement, what equation would I use?

• 3 x 2

• 3/14 x 2/14

• 3 + 2

• 3/14 + 2/14

What is the total value of (Cats)'

• 12

• 10

• 15

• 7

Observe this two way table. How many people took part in this survey?

• 55

• 180

• 125

• This two-way table cannot be completed with the information given

There are 14 coloured counters: 3 green, 5 blue, 2 red and 4 yellow. If I was after both a blue and a red counter without replacement, the probability would be?

• 0.051

• 0.055

• 0.51

• 0.5

What is the relative probability that someone who studies biology also studies math, but not English

• 0.21

• 0.40

• 0.11

• 0.38