6) A box contains ten light bulbs of which four are defective. A bulb is selected from the box and tested .If it is defective, another bulb is selected and tested, until non defective bulb is chosen. Let X= the number of bulbs chosen. a. Write to sample space. b. Find to probability distribution , expected value and variance of X.

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Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.