Mathematics

Problem

In the table below,

x

and

y

are two missing frequencies such that

y = 2x

. The total number of observations is

30

and the mean is

26

. Find the value of

x

. Class interval: 0–10 10–20 20–30 30–40 40–50 Frequency: 4

x

y

6 5 a) 7 b) 8 c) 5 d) 3