Question

Test scores mean of a class of 20 students is 83 and the mean of a second class of 10 students is 76. if the scores of both classes are combined what is the avergae of all the scores? explain

Answer 1

This is a weighted average. Are you cool with that term, "weighted average" or would you like me to explain?

Answer 2

can you explain it? thanks

Answer 3

mean = sum of the score/ number of scores

for for the 1st class find the sum of the scores, knowing the mean and number of students

83 = sum of scores/20


same process for the other class

76 = sum of the scores/10

then add the 2 sums together and divide by the total number of students, 30.

Answer 4

so what do you get as an answer?

Answer 5

whats your answer 1st

Answer 6

80.67

Answer 7

same as mine... well done

Answer 8

thank you so much