Question

Please answer this question fast

Answer 1

Answer:

48.4

Step-by-step explanation:

Central values (X) for classes and frequencies:

$\begin{array}{cc} X & f \\ 5&5\\15&9-5=4\\25&17-9=8\\35&29-17=12\\45&45-29=16\\55&60-45=15\\65&70-60=10\\75&78-70=8\\85&83-78=5\\95&85-83=2\end{array}$

Sum of marks = sum of each X × f = 5×5 + 15×4 + 25×8 + etc = 4115.

The total number of marks is 85.

Mean = 4115/85 ≈ 48.4