Determining the variance of data

Reference no: EM1316738

Q1) Door-to-door sales person for Household appliance has learned from her past experience that out of 10 demonstrations of her appliance only 4 result in actual sales (long run average). This week she requires making at least 5 sales. At least how many demonstrations does she require to do to ensure that probability of meeting her target is at least 90 percent?

2) If probability distribution of X is:

X	P(X)
3	1/8
4	1/8
5	3/8
6	3/8

Determine the variance of X? (Illustrate your computation either in Table or in Equation form)

Reference no: EM1316738

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