On a certain exam, Tony corrected 20 papers and found the mean for his group to be 60. Alive corrected the remaining 10 papers a

Question

3 years ago

13

nd found that the mean for her group was 50. What is the mean of the combined group of 30 students?

1 answer:

Ksivusya [100] · Answer 1 · 2022-04-27T15:46:06+03:00

Answer:

The mean of the combined group of 30 students is equal to 56.67

Step-by-step explanation:

Let

x ----> The sum of the notes of the 20 papers

y ----> The sum of the notes of the 10 papers

we know that

60=x/20 -----> x=60*20=1,200

50=y/10 -----> y=50*10=500

The mean of the combined group of 30 students is equal to

(x+y)/30

substitute

(1,200+500)/30=56.67