Bunuel wrote:
The bar graph below displays the number of temperature readings at each value from a sample, measured in degrees Fahrenheit. What was the average (arithmetic mean) temperature reading?
A. 111 degrees Fahrenheit
B. 112 degrees Fahrenheit
C. 113 degrees Fahrenheit
D. 114 degrees Fahrenheit
E. 115 degrees Fahrenheit
Another way to do it is, assume 110 as the average.
Add all the differences together
i.e. (110-110)*4 + (111-110)*3 + (112-110)*4 + (113-110)*1 + (114-110)*2 + (115-110)*2 = 0 + 3 + 8 + 3 + 8 + 10 = 32
Total number of readings = 16
Average increase = 32/16 = 2
Hence average = 110 + 2 = 112
Hence the correct answer is B.
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