Question

Students from two different schools do a Unit Test. There are 150 students at School A and themean score for School A is 66. There are 250 students at School B and the mean score for SchoolB is 58. Calculate the mean score of the 400 students.

Answer 1

Answer:

61

Explanation:

The mean of the 400 students can be calculated as the sum of the number of students by the mean score divided by the 400 students, so

$\begin{gathered} \text{ mean = }\frac{(66\times150)+(58\times250)}{400} \\ \\ \text{ mean = }\frac{9900+14500}{400} \\ \\ \text{ mean = }\frac{24400}{400} \\ \\ \text{ mean = 61} \end{gathered}$

Therefore, the mean score of the 400 students is 61