Percents And Probability Worksheet With Answers - Lesson 12-19 Page 45
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4913.
a. A coin was flipped 30 times. How many times would you expect to get tails? Explain.
b. After flipping a coin 30 times, Tim only had 2 tails. Do you think the coin is fair? Explain.
14.
Nick attempted 20 free throws and made 12 of them. Find the experimental probability Nick will make a
free throw.
15.
There are 6 black socks, 4 blue socks and 12 white socks in a drawer.
a. Find the theoretical probability of randomly picking one black sock.
b. Find the theoretical probability of randomly picking one blue sock.
c. Find the theoretical probability of randomly picking one white sock.
Copy the spinner on your paper. Color it so the given probabilities are true.
1 _
1 _
16.
17.
P(red) =
P(blue) =
4
2
1 _
1 _
18.
19.
P(green) =
P(yellow) =
8
8
Lesson 14 ~ Use Probability to Predict
20.
Edgar polled 50 seventh graders and asked if they would vote for Molly or Neisha in the upcoming
school election. Twenty students chose Molly and 30 chose Neisha.
a. Find P(a student votes for Molly) using experimental probability.
b. Use this probability to predict how many students will vote for Molly out of the 550 students
in the seventh grade class.
c. Would you predict a victory for Molly? Explain why or why not.
21.
Malcolm watched a basketball player make 16 of 20 two-point shots in a pre-game
warm-up. Use experimental probability to predict how many two-point shots the player
will make during a tournament if he has 35 attempts.
22.
If Jen rolls a number cube 36 times, how many times would you predict she rolls a 2?
23.
A spinner has 5 of 8 sectors colored red. Charlie spins the spinner 24 times. How many
times would you predict it will land on red?
24.
Rangers wanted to estimate the total number of elk in a
section of northeastern Oregon. They tagged 12 elk and
sent them back to the area. Two months later, the rangers spotted 4 of the
tagged elk out of 25 total elk spotted. Estimate the size of the elk population
in that section of northeastern Oregon.
25.
Bird specialists wanted to estimate the number of Tufted Puffins in a flock
off the coast. They tagged 30 Tufted Puffins and sent them back to their
flocks. One month later the specialists spotted 12 of the tagged birds out of
a total of 80 Tufted Puffins spotted. Estimate the size of the Tufted Puffin
flock off the coast.
115
Block 3 ~ Review
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