Q. 215.0( 2 Votes )

# Ten coins are tossed. What is the probability of getting at least 8 heads?

Answer :

Let X be the random variable for getting a head.

Here, n=10, r≥8

r=8,9,10

We know that,

∴P(X=r) = P(r=8) + P(r=9)÷P(r=10)

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A box has 100 pens of which 10 are defective. What is the probability that out of a sample of 5 pens drawn one by one with replacement at most one is defective?

Mathematics - ExemplarState True or False for the statements in the Exercise.

If A, B and C are three independent events such that P(A) = P(B) = P(C) = p, then

P (At least two of A, B, C occur) = 3p^{2} – 2p^{3}

A random variable X has the following probability distribution:

Determine:

(i) K (ii) P (X < 3)

(iii) P (X > 6) (iv) P (0 < X < 3)

**OR**

Find the probability of throwing at most 2 sixes in 6 throws of a single die

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