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प्रश्न
1500 families were surveyed and following data was recorded about their maids at homes
| Type of maids | Only part time | Only full time | Both |
| Number of families | 860 | 370 | 250 |
A family selected at random. Find the probability that the family selected has Both types of maids
उत्तर
Total number of families surveyed = 1500
n(S) = 1500
Number of families used maids = 860 + 370 + 250
= 1480
Number of families not using any maids = 1500 – 1480
= 20
Let E1 be the event of getting families use both types of maids
n(E1) = 250
p(E1) = `("n"("E"_1))/("n"("S"))`
= `250/1500`
= `25/150`
= `1/6`
Probability of getting both types of maids = `1/6`
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| Type of maids | Only part time | Only full time | Both |
| Number of families | 860 | 370 | 250 |
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| Type of maids | Only part time | Only full time | Both |
| Number of families | 860 | 370 | 250 |
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