Statistics

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Question

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Question 1 : The sum of 10 items is 12 and the sum of their squares is 18. The standard deviation is
1. 1/5
2. 2/5
3. 3/5
4. 4/5
Answer
8013

Question 2 : The algebraic sum of the deviation of 20 observations measured from 30 is 2. So, the mean of observations is
1. 30.0
2. 30.1
3. 30.2
4. 30.3
Answer
8014

Question 3 : When tested the lives (in hours) of 5 bulbs were noted as follows: 1357, 1090, 1666, 1494, 1623. The mean of the lives of 5 bulbs is
1. 1445
2. 1446
3. 1447
4. 1448
Answer
8015

Question 4 : If mode of a series exceeds its mean by 12, then mode exceeds the median by
1. 4
2. 6
3. 8
4. 10
Answer
8016

Question 5 : The median and SD of a distributed are 20 and 4 respectively. If each item is increased by 2, the new median and SD are
1. 22, 4
2. 22, 6
3. 20, 4
4. 20, 6
Answer
8017