6.9 Consumers in the UK are expected to spend more on Christ- mas presents this year with an average gift costing 28.70 pounds. (Data extracted from www.mirror.com.uk.) If the amount to be spent on Christmas gifts is normally distributed with a standard deviation of 12 pounds, find the following: a. The probability that a person in the UK will spend more than 15 pounds on a Christmas gift. b. The probability that a randomly selected person from the UK will spend between 12 and 14 pounds. c. Find the lower and upper limit for spending such that 95% of the purchases will fall within these limits