Probability and Data — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. A coin showed heads 12 of 20 flips. About how many heads in 100 flips?
A) 60
B) 50
C) 40
D) 70
Twelve heads per twenty flips equals sixty heads per one hundred flips.
2. A bar graph shows 6 apples, 9 pears, and 5 plums. Total fruit count?
A) 18
B) 20
C) 22
D) 21
Six plus nine plus five gives a total of twenty pieces of fruit altogether.
3. If 2 of 8 socks are striped, the probability of striped equals?
A) 1/2
B) 1/3
C) 1/4
D) 1/8
Two eighths reduces to one fourth using a common factor of two.
4. A tally chart shows 5 bundles and 4 singles. What is the count?
A) 20
B) 25
C) 28
D) 29
Five bundles equal twenty-five, plus four singles, gives a total of twenty-nine.
Part B: Fill in the Blank
Write the correct answer on each line.
1. If 4 of 20 spins land green, predicting 100 spins gives about 20 greens.
Four per twenty spins matches twenty per one hundred spins after scaling.
2. A bag has 3 red, 3 blue, and 6 white marbles. Probability of white is 6/12.
Twelve marbles total form the denominator of the probability fraction.
3. A bar graph shows 14 cars and 6 trucks. The total vehicle count is 20.
Combining bars on the graph gives the full vehicle count quickly.
4. A tally chart of 8 bundles and 2 extras totals 42.
Eight bundles equal forty, plus two singles, equals a total of forty-two.
5. If 5 of 20 cards are hearts, the probability of hearts simplifies to 1/4.
Five twentieths reduces to one fourth using a common factor of five.