STATISTICS MCQ SET 4
1. A variance of 20 observations is 5 . If each observation is multiplied by 2, then the variance of the resulting observation will be :
(a) 5
(b) 2 x 5
(c) 2ยฒ x 5
(d) 2 x 5ยฒ
Answer: C
2. If the variance of 5 value is 0.81 , then what is its standard deviation?
(a) 0.09
(b) 0.9
(c) 2.7
(d) 0.27
Answer: B
3. Calculate the standard deviation for the following data .
3 , 4 , 5 , 6 , 7
(a) โ6
(b) โ3
(c) โ2
(d) 2
Answer: C
4. Find the standard deviation of the following data (rounded off to two decimal places) .
5 , 3 , 4 , 7 .
(a) 1.48
(b) 3.21
(c) 4.12
(d) 2.45
Answer: A
5. Calculate the standard deviation for the following data .
4 , 7 , 9 , 10 , 15
(a) 2.733
(b) 3.133
(c) 3.533
(d) 3.633
Answer: D
6. The standard deviation of 12 values is 3 . If each value is increased by 4 , then find the variance of the new set of values .
(a) 7
(b) 16
(c) 25
(d) 9
Answer: D
7. Determine the mean deviation about their mean for the the data values 5 , 3 , 7 , 8 , 4 , 9
(a) 1
(b) 2
(c) 3
(d) 2.5
ย Answer: B
8. Find the mean deviation of the given data about their mean .
{4 , 6 , 7 , 3 , 5 , 5}
(a) 1
(b) 2
(c) 3
(d) 4
Answer: A
9. Find the coefficient of mean deviation from the following data :
3 , 8 , 7 , 6 , 5 , 1
(a) 0.4
(b) 0.5
(c) 0.3
(d) 0.6
Answer: A
10. What is the mean deviation of first 10 even natural numbers?
(a) 5
(b) 5.5
(c) 10
(d) 10.5
Answer: A
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