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A box of 80 candles consists of 30 defective and 50 non defective candles. If 10 of
this candles are selected at random by business man for sale, what is the probability
a. All will be defective
b. 6 will be non-defective
c. All will be non-defective
Two dice are rolled. Let X be a random variable denoting the sum of the numbers on
the two dice.
i) Give the probability distribution of X
ii) Compute the expected value of X and its variance
Among 15 clocks there are two defectives. In how many ways can an inspector chose
three of the clocks for inspection so that:
a. There is no restriction.
b. None of the defective clock is included.
c. Only one of the defective clocks is included.
d. Two of the defective clock is included.