Arithmetic mean of 20 observations is 15. If each observation is multiplied by then the arithmetic mean of them is |
|||||||

(a) |
10 |
(b) |
30 |
(c) |
45 |
(d) |
15 |

Arithmetic mean of 20 observations is 15. If each observation is multiplied by then the arithmetic mean of them is |
|||||||

(a) |
10 |
(b) |
30 |
(c) |
45 |
(d) |
15 |

There are 6 defective items in a sample of 20 items. One item is drawn at random. The probability that it is a non-defective item is |
|||||||

(a) |
(b) |
0 |
(c) |
(d) |

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