SOLUTION: 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 deviat

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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