Graphing Data - High School Math

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Question

In a standard deck of cards, with replacement, what is the probability of drawing two Ace of Hearts?

Answer

Probability of drawing first ace of hearts:

Probability of drawing second ace of hearts:

Multiply both probabilities by each other:

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Question

In a standard deck of cards, without replacement, what is the probability of drawing three kings?

Answer

Start with 52 cards, probability of drawing first king:

Now you have 51 cards. Probability of drawing second king:

Now you have 50 cards. Probability of drawing third king:

Multiply all probabilities:

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Question

Using a standard deck of cards, what is the probability of choosing a single face card?

Answer

There are cards in a standard deck: cards in suits. There are face cards (King, Queen, Jack) in each suit, so there are total face cards.

Thus the probability of choosing a single face card is or .

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Question

With a standard deck of cards, what is the probability of picking a spade then a red card if there is no replacement?

Answer

In a standard deck of cards:

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Question

Which of the following populations has a precisely normal distribution?

Answer

A normal distribution is one in which the values are evenly distributed both above and below the mean. A population has a precisely normal distribution if the mean, mode, and median are all equal. For the population of 3,4,5,5,5,6,7, the mean, mode, and median are all 5.

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Question

If a population has a normal distribution, the number of values within one positive standard deviation of the mean will be . . .

Answer

In a normal distribution, the number of values within one positive standard deviation of the mean is equal to the number of values within one negative standard deviation of the mean. The reason for this is that the values below the population mean exactly parallel the values above the mean.

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Question

What is the -score for a value of 115 when the mean of the population is 103 and the standard deviation is 8?

Answer

A -score indicates whether a particular value is typical for a population or data set. The closer the -score is to 0, the closer the value is to the mean of the population and the more typical it is. The -score is calculated by subtracting the mean of a population from the particular value in question, then dividing the result by the population's standard deviation.

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Question

A value has a -score of . The value is . . .

Answer

The -score indicates how close a particular value is to the population mean and whether the value is above or below the mean. A positive -score is always above the mean and a negative -score is always below it. Here, we know the value is below the mean because we have a negative -score.

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Question

A population of values has a mean of 43 and a standard deviation of 12. One of the values in the population is 49. What is the Z-score for that value?

Answer

A Z-score indicates whether a particular value is typical for a population or data set. The closer the Z-score is to 0, the closer the value is to the mean of the population and the more typical it is. The Z-score is calculated by subtracting the mean of a population from the particular value in question, then dividing the result by the population's standard deviation.

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