Durga prasad (Student CA CPT ) (116 Points)
11 June 20131)The S.D of weight of some members is 4.5 k.g.
After some time it was observed that each member was under weight by 0.5 kg then what is new S.D?
a) < 4.5 b) > 4.5 c) = 4.5 d) None
2)Two unbiased dies are thrown then the excepted value of sum on the sides of the die
a) 3.5 b) 7 c) 6 d) 12
Romil
(Student)
(88 Points)
Replied 11 June 2013
As regards the first question, I think S.D. will not change if every item was erroneously entered with same amount of difference. Only a measure of central tendency will change (i.e., mean, median, etc.) and the measure of dispersion will not change. Hence, according to me the answer is (c), viz., 4.5 kg.
CA Suraj Lakhotia
(IndigoLearn)
(4898 Points)
Replied 11 June 2013
| Outcome | Possible Ways | Probability | Expected Value | ||
| 2 | 1 | '1/36 | '2/36 | ||
| 3 | 2 | '2/36 | '6/36 | ||
| 4 | 3 | '3/36 | '12/36 | ||
| 5 | 4 | '4/36 | '20/36 | ||
| 6 | 5 | '5/36 | '30/36 | ||
| 7 | 6 | '6/36 | '42/36 | ||
| 8 | 5 | '5/36 | '40/36 | ||
| 9 | 4 | '4/36 | '36/36 | ||
| 10 | 3 | '3/36 | '30/36 | ||
| 11 | 2 | '2/36 | '22/36 | ||
| 12 | 1 | '1/36 | '12/36 | ||
| Expected Value | 7 |
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