# statistics help - 27936

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## kthrace05

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• From: Mathematics,
• Due on: Mon 07 Oct, 2013 (10:49am)
• Asked on: Mon 07 Oct, 2013
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1. Explain the difference between a discrete and a continuous random variable.

1.

Give three examples of a continuous random variable.

1.

Determine whether the distribution represents a probability distribution.

 X 3 7 9 12 14 P(X) 4/13 1/13 3/13 1/13 2/13
 a. Yes b. No
1.

Determine whether the distribution represents a probability distribution.

 X 5 7 9 P(X) 0.6 0.8 -0.4
 a. Yes b. No
1.

Determine whether the distribution represents a probability distribution.

 X 20 30 40 50 P(X) 0.05 0.35 0.4 0.2
 a. Yes b. No
1.

State whether the variable is discrete or continuous.

The speed of a jet airplane.

 a. discrete b. continuous7
1.

State whether the variable is discrete or continuous.

The number of people who play the state lottery each day.

 a. discrete b. continuous
1.

State whether the variable is discrete or continuous.

The time it takes to have a medical physical exam.

 a. discrete b. continuous
1.

State whether the variable is discrete or continuous.

The blood pressures of all patients admitted to a hospital on a specific day.

 a. discrete b. continuous
1.

The number of suits sold per day at a retail store is shown in the table, with the corresponding probabilities.

 Number of suitssold, X 19 20 21 22 23 Probability,P(X) 0.2 0.2 0.3 0.2 0.1

Please put the mean in the box rounded to one decimal place.

1.

The number of suits sold per day at a retail store is shown in the table, with the corresponding probabilities.

 Number of suitssold, X 19 20 21 22 23 Probability,P(X) 0.2 0.2 0.3 0.2 0.1

Please put the variance in the box rounded to two decimal places.

1.

The number of suits sold per day at a retail store is shown in the table, with the corresponding probabilities.

 Number of suitssold, X 19 20 21 22 23 Probability,P(X) 0.2 0.2 0.3 0.2 0.1

Please put the standard deviation in the box rounded to two decimal places.

1.

The county highway department recorded the following probabilities for the number of accidents per day on a certain freeway for one month. The number of accidents per day and their probabilities are shown. Find the mean.

Please put the mean in the box rounded to one decimal place.

 X 0 1 2 3 4 Probability,P(X) 0.4 0.2 0.2 0.1 0.1

1.

The county highway department recorded the following probabilities for the number of accidents per day on a certain freeway for one month. The number of accidents per day and their probabilities are shown. Find the variance.

 X 0 1 2 3 4 Probability,P(X) 0.4 0.2 0.2 0.1 0.1

Please put the variance in the box rounded to two decimal places.

1.

The county highway department recorded the following probabilities for the number of accidents per day on a certain freeway for one month. The number of accidents per day and their probabilities are shown. Find the mean.

Please put the standard deviation in the box rounded to two decimal places.

 X 0 1 2 3 4 Probability,P(X) 0.4 0.2 0.2 0.1 0.1

Please put the standard deviation in the box rounded to two decimal places.

1.

A pizza shop owner determines the number of pizzas that are delivered each day. Find the mean rounded to one decimal place.

 Number ofDeliveries, X 35 36 37 38 39 Probability,P(X) 0.1 0.2 0.3 0.3 0.1

1.

A pizza shop owner determines the number of pizzas that are delivered each day. Find the variance rounded to two decimal places.

 Number ofDeliveries, X 35 36 37 38 39 Probability,P(X) 0.1 0.2 0.3 0.3 0.1

1.

A pizza shop owner determines the number of pizzas that are delivered each day. Find the standard deviation rounded to two decimal places.

 Number ofDeliveries, X 35 36 37 38 39 Probability,P(X) 0.1 0.2 0.3 0.3 0.1

1.

Approximately 10% of American High School students drop out of school before graduation. Choose 10 students entering High School at random. Find the probability that at least 6 will graduate. Meaning P(graduating) = 100%-10% = 90% or p=.90 I changed it from 10.3% to 10% so p is 90% or .90, so that you can use the table to find the answer instead of the formula. Remember use 90% and use the table in the back of the text, Table B, not the formula for this one.

1.
It was found that 60% of American victims of health care fraud are senior citizens. If 10 victims are randomly selected, find the probability that exactly 3 are senior citizens. Use the table again, not the formula.
1.
Find these probabillities for a sample of 20 teenagers if 70% of them had compact disk players by the age of 16. Round to three decimal places, example 0.123.

a. At least 14 had CD players.

Use the table, not the formula.

1.
Find these probabillities for a sample of 20 teenagers if 70% of them had compact disk players by the age of 16. Round to three decimal places, example 0.123.

b. Exactly 9 had CD players.

1.
Find these probabillities for a sample of 20 teenagers if 70% of them had compact disk players by the age of 16. Round to three decimal places, example 0.123.

c. More than 17 had CD players.

1.

It has been reported that 83% of federal government employees use e-mail. If a sample of 200 federal government employees is selected, find the mean of the number who use e-mail.

1.

It has been reported that 83% of federal government employees use e-mail. If a sample of 200 federal government employees is selected, find the variance of the number who use e-mail, rounded to one decimal place.

1.

It has been reported that 83% of federal government employees use e-mail. If a sample of 200 federal government employees is selected, find the standard deviation of the number who use e-mail, rounded to one decimal place.

1.

Eighty-five percent of Americans favor spending government money to develop alternative sources of fuel for automobiles. For a random sample of 120 Americans, find the average number who favor government spending for alternative fuels.

Please put the mean in the box rounded to one decimal place or whole number.

1.

Eighty-five percent of Americans favor spending government money to develop alternative sources of fuel for automobiles. For a random sample of 120 Americans, find the variance for the number who favor government spending for alternative fuels.

Please put the variance in the rounded to one decimal place.

1.

Eighty-five percent of Americans favor spending government money to develop alternative sources of fuel for automobiles. For a random sample of 120 Americans, find the standard deviation for the number who favor government spending for alternative fuels.

Please put the standard deviation in the box rounded to three decimal places.

1.

In a survey, 63% of Americans said they own an answering machine. If 14 Americans are selected at random, find the probability that exactly 9 own an answering machine. You must use the formula for this one. It is the only one I assigned that you need the formula for.

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