JAMB - Mathematics (1980 - No. 19)
In a school, there are 35 students in class 2A and 40 in class 2B. The mean score for class 2 in an English Literature examination is 60.0 and that for 2B in the same paper is 52.5. Find, to one place of decimal, the mean for the combined classes
2.5
56.0
56.2
56.3
6.5
Wyjaśnienie
Total score for 2A & 2B = 4200
mean score = \(\frac{4200}{40 + 35}\)
= \(\frac{4200}{75}\)
= 56
mean score = \(\frac{4200}{40 + 35}\)
= \(\frac{4200}{75}\)
= 56