Test: Test #2 Question 10 of 10 This test: 50 point(s) possible This question: 6 point(s) possible Submit test The owner of an electronic store 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 Number of wants to know if he can offer a similar guarantee. His past service records are used to determine the probability distribution shown to the right. Complete parts a through c below. Days Probability 0.14 0.24 0.25 UI AWN 0.23 0.14 a. Calculate the mean number of days his customers wait for an HDTV repair. The mean is days. (Type an integer or a decimal.) b. Also calculate the variance and standard deviation. The variance is days. (Type an integer or a decimal.) The standard deviation is days. (Round to four decimal places as needed.) c. Based on the calculations in parts a and b, what conclusion should the manager reach regarding his company's repair times? Based on the probability distribution, the chances of exceeding four days for repair time is (Type an integer or a decimal.) Using the Empirical Rule, if the distribution is approximately bell shaped, the manager should conclude that about two-thirds of repair times are between | |and days. (Round to one decimal place as needed. Use ascending order.)