IUBAT–INTERNATIONAL UNIVERSITY OF BUSINESS AGRICULTURE AND TECHNOLOGY First term examination

STA 240 Set: Z

Full marks: 20 Time: 50 minutes

1. For the following table, construct a histogram:

class frequency 5 – 10 5

10 – 15 10 15 – 20 15 20 – 25 10 25 - 30 5

2. The mean of 10 numbers is 70. If one of the numbers is 100,

What is the mean of the other 4?

3. Find the mean for the series 10, 20, 30… 500.

4. What is the median of the sample 5, 5, 11, 10, 9, 8, 21, 5, 8?

5. Find the variance of first 10 natural numbers?

6. Find the two numbers whose AM=7 and SD=1.

Md. Mortuza Ahmmed