Percents And Probability Worksheet With Answers - Lesson 12-19 Page 16
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495.
Park Rangers wanted to estimate the total number of wild mustangs
in Central Oregon. They tagged 30 wild mustangs and sent them back
to the herd. They recorded the mustang population once a month for
the next three months as shown below.
Month 1
Month 2
Month 3
tagged mustangs in sample
8
10
15
total mustangs in sample
100
150
200
a. Estimate the size of the wild mustang population for each month.
b. Find the average of the three estimates in part a.
c. The rangers combined the three months into one large sample so they could consider a
sample of 100 + 150 + 200 = 450 mustangs. Estimate the size of the wild mustang population.
6.
One hundred twenty-five townspeople were interviewed at random. Forty interviewed townspeople
were from the middle school. The middle school has 800 students. Estimate the size of the town.
7.
According to the 2000 Oregon Voter Registration, 39% of Oregonians were Democrats and 36% of
Oregonians were Republicans.
a. Find P(a registered voter was a Democrat).
b. Find P(a registered voter was a Republican).
c. If 2,500,000 Oregonians voted in 2000, how many would you predict voted for Al Gore (Democrat)?
d. If 2,500,000 Oregonians voted in 2000, how many would you predict voted for George Bush
(Republican)?
e. What percentage of Oregonians did not declare they were a Democrat or a Republican in 2000?
8.
The Coast Guard was concerned about the growing number of harbor seals
in Newport Bay. They tagged 15 seals and sent them back into the bay.
After two months they checked a sample of 40 seals. Three of the seals
in the sample were tagged. Estimate how many seals are in Newport Bay.
9.
Use the spinner to the right.
a. Ross spun the spinner 12 times. Estimate the number of times he
landed on green.
b. Ross spun the spinner 18 times. Estimate the number of times he
landed on red.
10.
Rob rolls a number cube 24 times. Estimate the number of times he will roll a 5.
review
Write each percent as a fraction.
11.
12.
13.
25%
60%
100%
86
Lesson 14 ~ Use Probability To Predict
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