Stats Unit 3 Practice Test

X = the number of calculators a student personally owns. What is the standard deviation?

• 0.768

• 0.59

• 1.1

• 1.59

An algebra 2 test has 6 multiple choice questions with four choices with one correct answer each. If we just randomly guess on each of the 6 questions, what is the probability that you get exactly 3 questions correct?

• .962

• .132

• .0831

• .25

According to AccuData Media Research, 36% of televisions within the Chicago city limits are tuned to "Eyewitness News" is 5:00 PM on Sunday nights. At 5:00 PM on a given Sunday, 2500 such televisions are randomly selected and check to determine what is being watched. Would it be unusual to find that 898 of the 2500 televisions are tuned to "Eyewitness News"?

• Yes

• No

Tags

CCSS.HSS.ID.A.4

Salmi receives 4 emails in a week on average. Find the probability of receiving 8 emails for the next 2 weeks.

• 0.0511

• 0.0297

• 0.5470

• 0.1395

Is this a probability distribution?

• No
• Yes

Tags

CCSS.HSS.MD.A.3

CCSS.HSS.MD.A.4

Is this a probability distribution?

• No
• Yes

Tags

CCSS.HSS.MD.A.3

CCSS.HSS.MD.A.4

A student group sells 500 raffle tickets for $2 each. At the drawing the top prize will be a gift certificate for $100. Second prize will be a $50 gift card and there will be five 3rd prizes, each a $20 gift card. What is the expected value of a ticket (from the perspective of the ticket buyer)?

• lose an average of $5.53

• lose an average of $1.58

• win an average of $2.05

• lose an average of $10.00

Tags

CCSS.HSS.MD.B.5A

The American Red Cross says that about 11% of the U.S. population has Type B blood. A blood drive is being held at your school. What is the probability that at least 2 of the first 10 blood donors has Type B blood? 

• 0.088
• 0.697
• 0.214
• 0.303 

Tags

CCSS.HSF-LE.A.1C

Suppose 39% of Americans will vote for Donald Trump on election day. If a random sample of 8 voters are selected, what is the mean number of voters who will be voting for Trump?

• 4

• 8

• 3.l2

• 39

To find the mean of a binomial random variable

• Multiply the probability of success times the probability of failure.
• Multiply the number of trials times the probability of failure
• Multiply the number of trials times the probability of success.
• Multiply the number of trials times the probability of success times the probability of failure.

Tags

CCSS.HSS.MD.A.2