Download Worksheet 11.7 - Review After Spring Break.tst

Worksheet 11.7 Probability - Day 1
Name __________________________________________________
Solve the problem. Round to the nearest hundredth of a percent if needed.
1) In 1999 the stock market took big swings up and down. A survey of 990 adult investors
asked how often they tracked their portfolio. The table shows the investor responses. What
is the probability that an adult investor tracks his or her portfolio daily?
How frequently?
Response
Daily
223
Weekly
283
Monthly
293
Couple times a year 139
Don't track
52
1)
2) Use of the internet for shopping is increasing dramatically, but still is somewhat age
dependent. When a popular web site that sells books asked the age of users who bought
products from them over the internet, they obtained the following data. What is the
probability that a buyer on this web site is aged 60-69?
Age Group Number
10-19
1983
20-29
3685
30-39
2864
40-49
654
50-59
386
60-69
311
70-79
105
2)
3) A traffic engineer is counting the number of vehicles by type that turn into a residential
area. The table below shows the results of the counts during a four-hour period. What is
the probability that the next vehicle passing is an SUV?
Type of vehicle Number
Car
265
SUV
416
Van
75
Small truck
288
Large truck
209
Dump truck
25
Other
73
3)
4) During July in Jacksonville, Florida, it is not uncommon to have afternoon thunderstorms.
On average, 8.6 days have afternoon thunderstorms. What is the probability that a
randomly selected day in July will not have a thunderstorm?
4)
1
Find the probability.
5) A bag contains 2 red marbles, 9 blue marbles, and 4 green marbles. What is the probability
of choosing a blue marble when one marble is drawn?
5)
6) Two 6-sided dice are rolled. What is the probability the sum of the two numbers on the die
will be 5?
6)
7) A bag contains 7 red marbles, 4 blue marbles, and 1 green marble. What is the probability
of choosing a marble that is not blue when one marble is drawn from the bag?
7)
8) A bag contains 13 balls numbered 1 through 13. What is the probability of selecting a ball
that has an even number when one ball is drawn from the bag?
8)
9) A lottery game contains 25 balls numbered 1 through 25. What is the probability of
choosing a ball numbered 26?
9)
10) What is the probability that a card drawn from a deck of 52 cards is not red?
10)
11) What is the probability that a card drawn from a deck of 52 cards is not a 4?
11)
12) What is the probability that a card drawn from a deck of 52 cards is not a club?
12)
13) A bag contains 3 blue marbles, 7 green marbles, and 7 red marbles. One marble is drawn
from the bag. What is the probability that the marble drawn is not blue?
13)
14) A bag contains 24 marbles, of which 3 are blue and 5 are green. One marble is drawn
from the bag. What is the probability that the marble drawn is not blue?
14)
2
Answer Key
Testname: WORKSHEET 11.7 - REVIEW AFTER SPRING BREAK
1)
2)
3)
4)
22.53%
3.11%
30.79%
72.26%
3
5)
5
6)
1
9
7)
2
3
8)
6
13
9) 0
1
10)
2
11)
12
13
12)
3
4
13)
14
17
14)
7
8
3