Statistics Chapter 6 Test

When Stephen tells his teammates, “Trust me.”, the chance he has the correct answer is 50%. Assume he tells his teammates, “Trust me.” 7 times during a class period. What is the mean and sd for the distribution of the number of times he is correct?

• Mean: 3.5; SD: 0.5

• Mean: 4; SD: 6.5

• Mean: 3.5; SD: 0.5

• Mean: 3.5; SD: 6.5

• Mean: 3.5; SD: 1.323

At a certain wildlife refuge 41% of the ruddy duck population has selenium levels in their blood which can impair development of their offspring. Suppose wildlife managers capture 10 ducks for study. What is the probability exactly 6 ducks will have blood levels of selenium high enough to impair development of their offspring?

• (10C6) (6)0.59 (4)0.41

• (10C6) (0.41)6 (0.59)4

• (10C6) (0.59)4 (10)6

• (6C10) (0.41)10 (0.59)10

• (10C6) (0.59)4 (10)6

Consider a population where 46% are in favor of a tax to support animal shelters. A random sample of 13 people from the population is interviewed. What is the probability exactly 5 individuals are in support of the tax?

• 0.206

• 0.250

• 0.186

• 0.300

The chance of an EverCell AAA battery working properly is 62%. You test an “extra value pack” of 8 batteries in your calculator. What is the mean and SD for the distribution of the number of properly working batteries?

• Mean: 4.5; SD: 1.885

• Mean: 4; SD: 7.38

• Mean: 4; SD: 0.62

• Mean: 4.96; SD: 1.373

• Mean: 4.5; SD: 7.38

Tags

CCSS.HSS.ID.A.4

• 0.2508

• 0.1784

• 0.3125

• 0.4210

What is the value of P(X = 5) = binompdf(n = 13, p = 0.46, x = 5)?

• 0.192

• 0.134

• 0.256

• 0.089

What is the probability of getting exactly 2 successes in 5 trials with a probability of success 0.42 in each trial and probability of failure 0.58?

What is the probability that the first success occurs on the 4th trial if p = 0.43?

• 0.080

• 0.120

• 0.045

• 0.200

Tags

CCSS.HSS.MD.B.6

CCSS.HSS.MD.B.7

P(X= 7) = binompdf(n = 14, p = 0.47, x = 7) = _____

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