71). The Harmonic mean of 4 and 6 is
| A). 4.5 |
| B). 4.8 |
| C). 5 |
| D). 5.2 |
|
72). The arithmetic mean of 8 items is 2.5 and that of 12 items is 3. Then the arithmetic mean of the entire set of 20 items is
| A). 2.75 |
| B). 2.8 |
| C). 2.85 |
| D). 2.9 |
|
73). Standard deviation can be found
ll. Arithmetic mean can be found
III. Median can be found
IV. Mode can be found
Which of the above statement is wrong?
| A). I |
| B). II |
| C). IV |
| D). None of these |
|
74). The standard deviation of series : 1, 2, 3, 4, 5 is
| A). \( \Large \sqrt{2} \) |
| B). \( \Large \sqrt{55} \) |
| C). 11 |
| D). 55 |
|
75). The mean of first 10, multiple of 5 is
| A). 5 |
| B). 11 |
| C). 27.5 |
| D). 55 |
|
76). The median of the first 21 numbers is
| A). 10 |
| B). 11 |
| C). 12 |
| D). None of these |
|
77). Which of the following sets of data has equal median and mode
a) 1, 5, 7, 7, 7, 8, 10
b) 1, 3, 5, 7, 9, 5
c) 2, 4, 6, 8, 10, 8
d) 1, 2, 3, 7, 8, 8, 10
| A). (c) |
| B). (a) |
| C). (c) and (d) |
| D). None of these |
|
78). Consider the following set of values:
31, 27, 30, 28, 28, 29, 23
What can you say about the mean, median and mode of these values?
| A). They are the same |
| B). They are different |
| C). Cannot say surely |
| D). None of These |
|
