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तामिळनाडू बोर्ड ऑफ सेकेंडरी एज्युकेशनएस.एस.एल.सी. (इंग्रजी माध्यम) इयत्ता ९

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. Fi - Mathematics

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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 No maids

बेरीज

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 E3 be the event of getting family use no maids

n(E3) = 20

p(E3) = `("n"("E"_3))/("n"("S"))`

= `20/1500`

= `2/150`

= `1/75`

Probability of getting no maids = `1/75`

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पाठ 9: Probability - Exercise 9.2 [पृष्ठ ३०२]

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सामाचीर कलवी Mathematics [English] Class 9 TN Board
पाठ 9 Probability
Exercise 9.2 | Q 5. (iii) | पृष्ठ ३०२
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