Question

A box contains 140 USB drives 38 of which are defective. consider drawing a non-defective USB drive to be a success. if 25 USB drives are randomly selected without replacement, the results do not form a binomial distribution for which reasons select all that apply.

a. There is not a fixed number of trials.

b. The probability of success is not the same in each trial.

c. each trial has more than two possible outcomes.

d. The trials are dependent

One coin is weighted so that the probability that it lands tails up is 25% another coin is waited so that the probability that it lands tails up is 85% if each coin is tossed 5 times and the total number of tails is recorded, the results will not form a binomial distribution for which reasons. select all that apply.

a. each trial has more than two possible outcomes

b. The trials are dependent.

c. there is not a fixed number of trials.

d. The probability of success is not the same in each trial.

The probability of success is not the same in each trial.

students at the University have Heights that are normally distributed with the meaning of 165 cm and a standard deviation of 5.2 cm. The builders of a new student apartment complex must decide on how tall to make their doorways. find the doorway height which will allow 95% of students to enter without bending.

a. 160 cm

b. 156 cm

c. 174 cm

d. none of the above

students at a university have heights that are normally distributed with a mean of 165 cm in the standard deviation of 5.2 cm. suppose that the builders decide to make the doorways 170 cm high. what proportion of students will be able to answer the doorways without bending?

a. 0.9615

b. 0.8319

c. 0.1681

d. None of the above

when a class of 23 students took the SAT, they had a main score of 1445 with a standard deviation of 178. construct a 99% confidence interval for the mean sat score of all students.

a. (1381, 1509)

b. (1352, 1538)

c. (1340, 1550)

d. (1368 1522)

what is the margin of error of the confidence interval constructed.

What is the correct interpretation of the confidence interval constructed in the above problem.

a. we are 99% confident that the interval actually does contain

b. 99% of class averages will fall within the mean confidence interval.

c. there is a 99% chance that mean will fall within the confidence interval

d. none of the above is the correct interpretation of the confidence interval.

A bag contains 100 golf balls 66 of which are red consider drawing a red golf ball to be a success if 31 golf balls are drawn with replacement the result form a binomial distribution.

what is the probability that the fifth draw will be a success?

what is the mean?

what is the value of the standard deviation?

Answer 1

question 1)

Usb drives are selected without replacement.

Each selection influence another selection.

And probability of success is not same in each trail.

Answer option B and option D

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