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# CBSE Class 12-science Answered

4. The probability that a visitor in the dining room will need the first course is equal to 0.8.  Find the probability that out of 100 visitors, no less than 75 and no more than 90 visitors will order the first dish.
Asked by surajsharmaisonline | 20 Jan, 2023, 12:28: PM
Expert Answer
Probability of ordering the first course by a visitor = 0.8

Probability of not ordering the first course by a visitor = 0.2

Probability p(75) of ordering the first course by exactly 75 visitors out of 100 visitors is

p(75) = =

Probability p(76) of ordering the first course by exactly 76 visitors out of 100 visitors is

p(76) = =

Similarly for 77, 78, ...............................90 visitors
.
.
.
.
.

Probability p(90) of ordering the first course by exactly 90 visitors out of 100 visitors is

p(90) = =

probability of not less than 75 visitors and not greater than 90 visitors out of 100 visitors is

Answered by Thiyagarajan K | 21 Jan, 2023, 10:15: AM

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