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What do we call a graph of probabilities associated with all the possible values taken by a continuous random variable?

	Distribution stress function
	Probability density function
	Probability mass function
	Probability tension function

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The number of chocolate chips in a popular brand of cookie is normally distributed with a mean of 19 chocolate chips per cookie and a standard deviation of 3.7 chips. When the cookies come out of the oven, only the middle 90% in terms of the number of chocolate chips are acceptable (the rest are considered defective). Rounded to a whole number of chips, what are the cutoff numbers for the number of chocolate chips in acceptable cookies?

	15 and 23
	13 and 25
	11 and 27
	not enough information to answer

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Based on the graph of this normal distribution. 85 95 105 115 125 135 145Based on the graph of this normal distribution. 85 95 105 115 125 135 145\f