A number from 1 to 100 is selected at random.
P(85) =
1/100
100
The probability of a CD case being defective is 1/520. If the factory makes 7,800 cases per week, how many are likely to be defective?
about 15
100
Suppose you want to find out how students feel about new school colors. You interview students while they are in art class. Is this a good sample?
No; the sample includes only students interested in art, not the whole population.
100
6!/2!
360
100
Is the event dependent or independent. You roll a number cube. Then you roll it again.
Independent
200
A number from 1 to 100 is selected at random.
P(105)=
0
200
In a random survey, 8 out of 18 students would rather go to an amusement park than to the zoo. In a group of 225 students, how many students can you expect to prefer the amusement park?
about 100 students
200
Rewrite the question so it is fair. "Do you prefer salad or a nice juicy steak for dinner?"
Do you prefer a salad or steak for dinner?
200
4P3
24
200
A drawer contains 3 black socks and 2 white socks. A sock is drawn at random and then replaced. P(2 blacks) =
9/25
300
A number from 1 to 100 is selected at random.
P(number divisible by 9)
11/100
300
Suppose you roll a number cube 25 times. Predict the number of times you will roll a 4?
About 4
300
Rewrite so the question is fair. " Isn't purple your favorite color?"
What is your favorite T-shirt color?
300
18C2
153
300
A drawer contains 3 black socks and 2 white socks. A sock is drawn at random and then replaced. P(white, then black)=
6/26
400
A number from 1 to 100 is selected at random.
P(number containing a 4) =
19/100
400
A spinner is divided into different colored sections. The probability of the spinner landing on the purple section is 2/7. Predict how many times the spinner lands on the purple section if it spins 98 times.
about 28 times
400
Explain the bias in the following question. "Don't you agree that Mrs. Meredith expects too much of her students?"
Questioner is giving away his or her own feelings.
400
If 12 people are playing in a tournament and each person plays every other person, how many games will be played?
66 games
400
The letters MASSACHUSETTS is written on a separate slip of paper. The 13 slips of paper are placed in a sack and two slips are drawn at random. The first pick is not replaced. P(M, then S)=
1/39
500
You have 5 one-dollar bills, 3 five dollar bills and 1 ten dollar bill in your pocket. What are the odds in favor of selecting a one dollar bill?
5:4
500
Suppose the probability of being an eighth-grader at Sunrise Middle School is 1/3. The probability of an eighth-grader being in Mr. Shelton's math class is 2/7. Predict how many of the school's 630 students are in Mr. Shelton's eighth-grade math class.
About 60
500
Explain why this question is biased. "How do you like your eggs cooked?"
It assumes you like eggs.
500
In how many different ways can you choose two magazines from a shelf of ten magazines in a store?
45 ways
500
The letters MASSACHUSETTS is written on a separate slip of paper. The 13 slips of paper are placed in a sack and two slips are drawn at random. The first pick is not replaced. P(S, then S)=