ABSTRACT
Questions 7 to 9 relate to the following information: A box contains 35 brass washers, 40 steel washers and 25 aluminium washers. 3 washers are drawn at random from the box without replacement.
7. The probability that all three are steel washers is: (a) 0.0611 (b) 1.200 (c) 0.0640 (d) 1.182
8. The probability that there are no aluminiumwashers is: (a) 2.250 (b) 0.418 (c) 0.014 (d) 0.422
9. The probability that there are two brass washers and either a steel or an aluminium washer is: (a) 0.071 (b) 0.687 (c) 0.239 (d) 0.343
10. The number of faults occurring on a production line in a 9 week period are as shown:
32 29 27 26 29 39 33 29 37
The third quartile value is: (a) 29 (b) 35 (c) 31 (d) 28
Questions 11 and 12 relate to the following information: The frequency distribution for the values of resistance in ohms of 40 transistors is as follows:
15.5 – 15.9 3, 16.0 – 16.4 10, 16.5 – 16.9 13, 17.0 – 17.4 8, 17.5 – 17.9 6
11. The mean value of the resistance is: (a) 16.75 (b) 1.0 (c) 15.85 (d) 16.95
12. The standard deviation is: (a) 0.335 (b) 0.251 (c) 0.682 (d) 0.579
Questions 13 to 15 relate to the following information. The probability of a component failing in 1 year due to excessive temperature is
1 16
, due to
excessive is 1
humidity
is 1 40
13. The probability that a component fails due to excessive temperature and excessive vibration is:
(a) 285 320
(b) 1 320
(c) 9 80
(d) 1 800
14. The (a) 0.00125 (b) 0.00257 (c) 0.0750 (d) 0.1125
15. The probability that a component will not fail because of both excessive temperature and excessive humidity is: (a) 0.914 (b) 1.913 (c) 0.00156 (d) 0.0875
The companion website for this book contains the above multiple-choice test. If you prefer to attempt the test online then visit:
For a copy of this multiple choice test, go to: www.routledge.com/cw/bird
