6, Ms. Pipping\'s 9th grade class, consisting of 28 students, was surveyed, and

Question

6, Ms. Pipping's 9th grade class, consisting of 28 students, was surveyed, and 39.3% of the students reported that they had at least one pet. The average ninth-grade class size i California is 32. If the students in Ms. Pipping's class are representative of students in the state's ninth-grade classes, and there are 3,400 ninth-grade classes in the state, which of the following best estimates the number of ninth-grade students in the state who have no pets? A. 37,414 B. 37,645 C. 57,786 D. 66,042 72

Explanation / Answer

Percentage of students with atleast one pet = 39.3%
So percentage of students with no pets = 100 - 39.3 = 60.7%
Average number of students in each class = 32
Total number of classes = 3400
So total number of students = 3400 * 32 = 108800.
Number of students with no pets = 60.7% of 108800 = 66041.6 which when rounded we get 66,042.
So the answer is D.

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