Question

8.
The widths of 50 leaves of a plant were measured in mm and their cumulative
frequency distribution is shown in the following table. Make an ordinary
frequency distribution table with class intervals for this.

Answer 1

Answer:

We can calculate the mean as:

Thus, mean number of plants per house is 8.1.

Since, values of xi and fi are small

We have used the direct method.

2. Consider the following distribution of daily wages of 50 workers of a factory.

Find the mean daily wages of the workers of the factory by using an appropriate method.

Sol. Let the assumed mean, a = 150

Class interval h = 20

We have the following table:

Now

= 145.2

3. The following distribution shows the daily pocket allowance of children of a locality. The mean pocket allowance is Rs. 18. Find the missing frequency f.

Sol. Let the assumed mean, a = 16

Class interval h = 2