Question

The mean grad of a section of 20 students is 66% and that of another section of 15 students is 70%. What is the combined mean grad?
66.7%
67.7%
68.7%
69.7%
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Answer 1

Answer:

⇒ Average grade of 20 students is 66%.

∴ Total grade of 20 students =20×66%=1320%

⇒ Average grade of 15 students is 70%.

∴ Total grade of 15 students =15×70%=1050%

⇒ Total students =20+15=35

⇒ Total grade of 35 students =1320%+1050%=2370%

∴ Required mean grade =

35

2370%

=67.7%

Answer By

Step-by-step explanation:

plzz mark as a brainlist answer.