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Don’t waste time in massive calculations of finding the numbers of students in each field finding the weighted average, etc. It’s a simple calculation if you bear in mind the total number of students is the same (=5,192) so it can be ignored altogether.
Average = (23 x 80 + 25 x 65)/(23+25) = 72.18
NOTE: because 23 and 25 are so close even a simple average of 65 and 80 would have given 72.5
A: The lowest average salary is for Humanities majors at around 45,000. TRUE
B: The range is the difference between the lowest average salary and the highest average salary
85,000 – 45,000 = 40,000 FALSE
C: Don’t calculate. For the number of business majors to exceed the number of engineering majors by 500 the difference in the % must be close to 10%. But the difference is 31% – 25% = 6% only. FALSE
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