Question 231925: 1-A headlight company claims that the average headlight they produce lasts 300 days. A scientist randomly selects 15 headlights. The sample mean is 290 days, with a standard deviation of 50 days. If the company’s claim were true, what is the probability that 15 randomly selected headlights would have an average life of no more than 290 days?: *
2-A champion gambler attends a tournament in Las Vegas. His particular probability of winning a game of poker is 70%. What is the probability that the first poker game he wins in the tournament is his fifth game?:
3-The number of animals kept in a room at a randomly selected shelter is described by the following data. What is the probability that 3 or more animals are kept in a room?: *
NUMBERS OF ANIMAILS 1 2 3 OR MORE
PROBABILITY 0,55 0,38 ?
4-Which of the following is a reason to use a one-sample t-test instead of a one-sample z-test?: *
a. The variables are continuous.
b. The standard deviation of the population is unknown.
c. The sample size is large.
d. None of the above.
5-Two fair six-sided dice are thrown. If the sum of the dice is even, what is the probability that at least one 6 is showing?: *
A. 5/36
B. 1/12
C. 11/36
D. 1/6
6-Suppose A and B are independent random variables. The variance of A is 9, and the variance of B is 7. Let C=A-B. What is the standard deviation of C?: *
a. 1.4
b. 2.0
c. 3.7
d. 4.0
Answer by mgenesi19(1)   (Show Source):
You can put this solution on YOUR website! The number of animals kept in a room at a randomly selected shelter is described by the following data. What is the probability that 3 or more animals are kept in a room?: *
NUMBERS OF ANIMAILS 1 2 3 OR MORE
PROBABILITY 0,55 0,38 ?
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