SHEILA

. A grocery story recorded amount of time that 20 randomly selected shoppers waited checkout lines. The mean was 322 seconds (5 minutes, 22 seconds) and the standard deviation was 48 seconds. Construct a 95% confidence interval for the mean wait time for...

1)A quiz consists of 8 multiple choice questions, each with 5 possible answers. If random guesses are made for all 8 questions, find the probability that a student will answer exactly 5 correctly. A. 0.999 B. 0.009 C. 0.990 D. There is not enough informat...

The weights of black bears are normally distributed with a mean of 264 kg and a standard deviation of 38 kg. Let X be the weight of a randomly selected black bear. Use this information for exercises 2 and 3. 2. If P(a < X < 264) = 0.1139, find the value o...