4. Smith Electronics is a family-owned electronics repair business in Kansas City. The owner has read an advertisement from a local competitor that guarantees all high-definition television (HDTV) repairs within four days. Based on his company's experience, he wants to know if he can offer a similar guarantee. His past service records are used to determine the following probability distribution: Number of Days Probability 1 0.12 2 0.25 3 0.30 4 0.18 5 0.15 (A) Calculate the mean number of days his customers wait for an HDTV repair. (B) Also calculate the variance and standard deviation. (C) Based on the calculations in parts a and b, what conclusion should the manager reach regarding his company's repair times?

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