The shape of the distribution of the time required to get an oil change at a 20-minute oil-change facility is skewed right. However, records indicate that the mean time is 21.4 minutes, and the standard deviation is 4.2 minutes. Complete parts (a) through (c). C. The sample size needs to be less than or equal to 30. D. Any sample size could be used. (b) What is the probability that a random sample of n= 40 oil changes results in a sample mean time less than 20 minutes? The probability is approximately 0.0175 (Round to four decimal places as needed.) (c) Suppose the manager agrees to pay each employee a $50 bonus if they meet a certain goal. On a typical Saturday, the oil-change facility will perform 40 oil changes between 10 A.M. and 12 P.M. Treating this as a random sample, there would be a 10% chance of the mean oil-change time being at or below what value? This will be the goal established by the manager. There is a 10% chance of being at or below a mean oil-change time of minutes. (Round to one decimal place as needed.) (1,1) More Help me solve this View an example Get more help - Media - Clear all Check answer 2:33 PM 2, 3/31/2022 DII ho 12 insert prt sc delete & 5 7 backspace home T P pg up L G K enter pause 0O R %24

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