Let x represent the dollar amount spend on supermarket impulse buying in a 10-minute unplanned shopping interval. The mean of this distribution is µ=$20 and the standard deviation is =$7. If we assume the x distribution is approximately normal: (1) What is the probability that a randomly selected shopper will spend between $18 and $22? (1) Consider a random sample of n = 100 shoppers. What is the probability that is between $18 and $22? (2) State two different ways we know the distribution from part (b) is normally distributed.

Let x represent the dollar amount spend on supermarket impulse buying in a 10-minute unplanned shopping interval. The mean of this distribution is µ=$20 and the standard deviation is =$7. If we assume...

Let x represent the dollar amount spend on supermarket impulse buying in a 10-minute unplanned shopping interval. The mean of this distribution is µ=$20 and the standard deviation is =$7. If we assume the x distribution is approximately normal:
1. (1) What is the probability that a randomly selected shopper will spend between $18 and $22?
2. (1) Consider a random sample of n = 100 shoppers. What is the probability that is between $18 and $22?

(2) State two different ways we know the distribution from part (b) is normally distributed.

Jun 02, 2022