An ¯x chart with three-sigma limits has parameters as follows: UCL = 86 Center line = 80 LCL = 74 n = 5 (a) (10 pts) Suppose the process quality characteristic being controlled is normally distributed. The true mean is 82 and standard deviation is 6. What is the probability that among three consecutive samples, at least two consecutive samples will be in control?

(co 3) the times that customers spend in a book store are normally distributed with a mean of 39.5 minutes and a standard deviation of 9.4 minutes. a random sample of 25 customers has a mean of 36.1 minutes or less. would this outcome be considered unusual, so that the store should reconsider its displays? no, the probability of this outcome at 0.035, would be considered usual, so there is no problem yes, the probability of this outcome at 0.035, would be considered unusual, so the display should be redone no the probability of this outcome at 0.359 would be considered usual, so there is no problem yes, the probability of this outcome at 0.965 would be considered unusual, so the display should be redone