SOLUTION: A large electronics firm employs many disabled workers. The number of workers and type of disability are summarised in the table below:
Employee’s Performance
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Employee’s Performance
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Question 1204048: A large electronics firm employs many disabled workers. The number of workers and type of disability are summarised in the table below:
Employee’s Performance
Above average Average Below average Total
Blind 21 64 17 102
Deaf 16 49 14 79
No Disability 29 93 28 150
Total 66 206 59 331
If an employee is selected at random, what is the probability that:
4.1 The employee will have no disability?
4.2 The employee will be blind?
4.3 The employee will perform above average given that he/she is blind?
4.4 The employee will either be blind or perform above average?
4.5 Are the events above average performance and no disability independent events? Show calculations to substantiate your answer.
4.6 A coin is tossed three times. Find the probability of obtaining:
4.6.1 All heads
4.6.2 Two heads and one tail
I will solve the second problem, ONLY, which is 4.6, 4.6.1, 4.6.2.
4.6.1. P = = . ANSWER
In wording form: in all, 8 outcomes are possible:
(1) H H H
(2) H H T
(3) H T H
(4) H T T
(5) T H H
(6) T H T
(7) T T H
(8) T T T
Of them, only one outcome is favorable: it is (H H H).
It gives the probability .
4.6.2. In the list of possible outcomes above,
find all outcomes with two H and one T.
There are three such outcomes. They are (2), (3) and (5).
Therefore, the probability in this problem is P = . ANSWER
