A preschool classroom 20 three-years-old and 10 four-years-old. The average height for the three-years-old is 37 inches, and the average height for the four-years-old is 40 inches. What is the average height of the 30 students in the classroom?
A. 37 inches
B. 37.5 inches
C. 38 inches
D. 38.5 inches
E. 39 inches
The OA is C
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Solution:swerve wrote: ↑Thu Nov 05, 2020 12:14 pmA preschool classroom 20 three-years-old and 10 four-years-old. The average height for the three-years-old is 37 inches, and the average height for the four-years-old is 40 inches. What is the average height of the 30 students in the classroom?
A. 37 inches
B. 37.5 inches
C. 38 inches
D. 38.5 inches
E. 39 inches
The OA is C
The average height of the 30 students in the classroom is:
(20 x 37 + 10 x 40) / 30 = (740 + 400)/30 = 1140/30 = 38 inches
Answer: C
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