A department store has its own store credit card, where monthey batunces of cuitomers credit hare a mean of 4 tho and a standard deviation of 140.50 . a) What assumption is needed to use the 2 tabiect fariethy expiuin. b) What is the probability that are rarigemiy thoreth cubarmed has molit tham 5 Roo gwing on theie store chedif card? c) What is the maximum value of cred it that the lowest 37.35 w of customers owie on thatie ataec eredit cardt 5 obew BAKGC WOEkings to SUPPOAT voup ANSWER. d) 5ay, now that a random sample of 36 customers with store credit cards as taken state the value of the centre an spread of the sampling distribution of the sample mean