AP Stats 1st Semester Review - Chapter 6

Which of the following random variables should be considered continuous?

• The time it takes for a randomly chosen woman to run 100 meters

• The number of brothers a randomly chosen person has

• The number of cars owned by a randomly chosen adult male

• The number of orders received by a mail-order company in a randomly chosen week

• None of the above

A variable whose value is a numerical outcome of a random phenomenon is called

• a random variable.

• a parameter.

• biased.

• a random sample.

• a statistic.

Which of the following is not a random variable?

• The heights of randomly-selected buildings in New York City.

• The suit of a card randomly-selected from a 52-card deck.

• The number of children in randomly-selected households in the United States.

• The amount of money won (or lost) by the next person to walk out of a casino in Las Vegas.

• All of the above are random variables.

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CCSS.HSS.MD.A.2

Let X be the outcome of rolling a fair six-sided die.   $P\left(2\le x<5\right)=$  

• 1/6.

• 1/3.

• 1/2.

• 2/3.

• 5/6.

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CCSS.7.SP.C.7B

I roll a pair of fair dice and let X = the sum of the spots on the two sides facing up. The probability that X is 2, 11, or 12 is

• 1/36.

• 2/36

• 3/36.

• 4/36.

• 3/11.

Which of the following is the mean of X?

• 0.5

• 1

• 1.2

• 2

• The answer cannot be computed from the information given.

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CCSS.HSS.MD.A.2

Which of the following is the standard deviation of X?

• 1

• 0.6325

• 0.4472

• 0.4

• The answer cannot be computed from the information given.

The probability that a random scratch-card will pay off is

• 0.0250

• 0.0601

• 0.2500

• 0.6010

• 0.8500

The density curve for a continuous random variable X has which of the following properties?

• The probability of any event is the area under the density curve between the values of X that make up the event.

• The total area under the density curve for X must be exactly 1.

• $P\left(x=a\right)=0$ for any constant a

• The density curve lies completely on or above the horizontal axis.

• All of the above.

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CCSS.7.SP.C.7A

 $P\left(1\le x\le2\right)\ has\ value$  

• 0.50
  

• 0.33

• 0.25

• 0.00

• none of these.

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CCSS.6.SP.B.4

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