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Probability

A number is s...

Question

A number is selected from the numbers 3, 5, 5, 7, 7, 7, 9, 9, 9, 9. Find the probability that the selected number is their average.

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Q. Study the following number line and answer the questions that follow.
2 5 9 1 7 2 5 1 9 7 3 9 5 2 4 6 8 1 9 7 5 2 7 3 1 9 7 8 5 2 6 5 4 1 9 7 8 2 0 1 0 9 7 8 5 1 9 7 3 5 1 6 9 7 2 1 7 3 7 9 5 1

How many times is number '3' preceded by number '7' and not followed by an even number?

Q. A number is selected at random from the numbers: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11....................... 95, 96, 97, 98, 99, 100. What is the probability that the sum of digits of the selected number is 10?

Q. Study the following number line and answer the questions that follow.
2 5 9 1 7 2 5 1 9 7 3 9 5 2 4 6 8 1 9 7 5 2 7 3 1 9 7 8 5 2 6 5 4 1 9 7 8 2 0 1 0 9 7 8 5 1 9 7 3 5 1 6 9 7 2 1 7 3 7 9 5 1

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Q. Two numbers are selected simultaneously from the set {6, 7, 8, 9, ………. 39}. If the sum of selected numbers is even then the probability that both the selected numbers are odd, is equal to:

b

c

are selected at random (with replacement from numbers

1, 2, 3, 4, 5, 6, 7, 8, 9)

. The probability that

x^{2} + b x + c > 0 \forall x ϵ R

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