The following frequency distribution shows the marks obtained by 70 students in a test.

$$\begin{array}{c|c}
\text{Mark (out of 100)} & \text{Frequency} \\hline
10 & 4\
20 & 5\
30 & ?\
40 & 6\
50 & 7\
60 & 8\
70 & ?\
80 & 9\
90 & 10
\end{array}$$

The mean mark of the whole class is 55. Determine the missing frequencies for marks 30 and 70.

Question

The following frequency distribution shows the marks obtained by 70 students in a test.

$$\begin{array}{c|c}
\text{Mark (out of 100)} & \text{Frequency} \\hline
10 & 4\
20 & 5\
30 & ?\
40 & 6\
50 & 7\
60 & 8\
70 & ?\
80 & 9\
90 & 10
\end{array}$$

The mean mark of the whole class is 55. Determine the missing frequencies for marks 30 and 70.

Accepted Answer

Frequency for 30 = 5, frequency for 70 = 8

Neco Model Questions Vol1 2017 Mathematics Question 29

Answer Options

About This Question

Master the Exam!