63.

Find the mean of the following distribution:

x	f
4	5
6	10
9	10
10	7
15	8

Find the mean of the following distribution:

In the distribution, the frequency of the class 3-5 is

4, 8, 3, 6, 7, 2, 3, 5, 9, 4, 6, 5, 5.

• 2

• 4

• 5

• 5

The range of the following frequency distribution is

2.7, 2.7, 2.8, 2.1, 2.4, 3.2, 2.1, 3.1, 2.8, 3.2.

• 2.1
• 1.6
• 5.3
• 5.3

• 6
• 10
• 5
• 5

In the distribution, the frequency of the class 0–5 is

0, 3, 2, 5, 8, 10, 13, 5, 6, 6, 14, 0. 

• 11

• 2

• 3

• 3