This document contains instructions for a statistics exam with 6 multiple choice questions. The questions include: constructing a histogram from frequency data; calculating mean when one value is known; finding the mean, median, and variance from data sets; and determining two numbers when their average and standard deviation are given. The exam is for the course STA 240 at IUBAT–INTERNATIONAL UNIVERSITY OF BUSINESS AGRICULTURE AND TECHNOLOGY.

1. 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