Statistics and Probability — Test

Question 1

Which of the following is a valid probability distribution?

Revolt · Accepted Answer

Image with description The bar graph is titled Probability Distribution D. The horizontal axis lists 0 to 6 in increments of 1 and is labeled as x. The vertical axis lists 0 to 0 point 6 in increments of 0 point 1 and is labeled as a P subscript x of x. There are 5 bars on the graph. The first bar is at 1 and its height is 0 point 2, the second bar is at 2 and its height is 0 point 1, the 3rd bar is at 3 and its height is 0 point 1, the 4th bar is at 4 and its height is 0 point 5, and the 5th bar is at 6 and its height is 0 point 1.

Question 2

The scores of the students on a standardized test are normally distributed, with a mean of 500 and a standard deviation of 110 What is the probability that a randomly selected student has a score between 350 and 550 ? Use the portion of the standard normal table to help answer the question. z Probability 0 point 0 0 0 point 5 0 0 0 0 point 2 5 0 point 5 9 8 7 0 point 3 5 0 point 6 3 6 8 0 point 4 5 0 point 6 7 3 6 1 point 0 0 0 point 8 4 1 3 1 point 2 6 0 point 8 9 6 1 1 point 3 5 0 point 9 1 1 5 1 point 3 6 0 point 9 1 3 1

Revolt · Accepted Answer

24 percent; 59 percent

Question 3

Which normal distribution has the greatest standard deviation?

Revolt · Accepted Answer

Image with description A normal distribution is shown on x-axis with markings from negative 8 to 40 in increments of 8. The curve has a peak at 16.

Question 4

You pick a card at random from an ordinary deck of 52 cards. If the card is a diamond, you get some points; if not, you lose 2 points. What value for the diamonds would make the game fair?

Revolt · Accepted Answer

6

Question 5

Which statement must be true?

Revolt · Accepted Answer

Each distribution has a different mean and a different standard deviation.

Statistics and Probability — Test Answers

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