The average value of a diagnostic test from 10 students is 55. If we add 5 more student so the total number of students is 15, the average value changes to 53. How much is the average value from the last 5 students?

kriauklasvt

kriauklasvt

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2022-08-26

The average value of a diagnostic test from 10 students is 55. If we add 5 more student so the total number of students is 15, the average value changes to 53
How much is the average value from the last 5 students?

Answer & Explanation

Douglas Woodard

Douglas Woodard

Beginner2022-08-27Added 8 answers

If the average of the the first 10 students is 55, then the sum of their total scores is 55 10 = 550. If you add 5 more students and the average is 53, then the total would be
15 53 = 795
Subtract 550 from that to get the total for the 5 new students, which is 245. Then, simply divide that by 5 to get the average, which is
245 5 = 49

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