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What was the average score given on the retest?

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17 people rated a product and gave it an average of only 2 out of 10.

After improvements 15 of them retested the product and the average score rose to 5 out of 10.

What was the average score given on the retest?

posted Jun 17, 2015 by Aman

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1 Answer

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8.4 out of 10

17 people- first test average = 2/10,
17+15= 32 people- total test average = 5/10
15 people retest average= ?

17x/17=2/10==> x=2/10
(17x+15y)/32=5/10==> 17*2/10+15y=16==> 15y=16-17/5, y=63/75=84/100 or 8.4/10
Retest average was 8.4 out of 10

answer Aug 1, 2018 by Hanifa Mammadov



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