Stats MCQs from books chapter
1. what is the sum of 10 numbers if there mean is 9
A. 70
B. 80
C. 90
D. 100
2. For finding the average speed of a journey which is the appropriate average?
A. Geometric mean
B. Harmonic mean
C. Arithmetic mean
D. mode
3. What is the geometric mean of two numbers x and y?
A. xy
B. x – y
C. x + y
D. square root of xy
4. If all observations are increased by 10% and mean of 10 observations is 10. What is the increased observation?
A. 15
B. 100
C. 30
D. 11
5. 2, 4, 8 and 64, find the geometric mean of these numbers.
A. 64
B. 32
C. 16
D. 8
6. Mean, median and mode are always ______________ if the distribution is symmetrical.
A. never equal
B. Always equal
C. sometimes equal
D. none of these
7. What is the harmonic mean of two numbers x and y
A. 2xy/x+y
B. xy/x+y
C. x+y/xy
D. 2/x + y
8. Coding method is used for calculation of the
A. weighted mean
B. Median
C. mean
D. mode
9. Two number 5 and 4 are Am and GM of numbers respectively then find HM of numbers.
A. 25/16
B. 2/5
C. 16/5
D. 2/5
10. Mode of the series 2, 2, 2, 2, 3, 3, 4, 4, 3, 2, 2, 3, 4
A. 2
B. 3
C. 4
D. none of these
11. It is impossible to calculate ________________ if any value in series is zero.
A. Geometric mean
B. Harmonic mean
C. Arithmetic mean
D. mode
12. Mode of 2, 3, 4 is
A. 2
B. 3
C. 4
D. none of these