(a) A sales person has a 20% chance of making a sale each time they call on a customer. Find the probability that if the

[answerhappygod]

A A Sales Person Has A 20 Chance Of Making A Sale Each Time They Call On A Customer Find The Probability That If The 1 (54.82 KiB) Viewed 36 times

(a) A sales person has a 20% chance of making a sale each time they call on a customer. Find the probability that if they call on 10 customers they will make: (i) 9 sales (ii) At least 9 sales (iii) At least 1 sale (b) A manufacturer sells a product by weight and states on the packaging that the average weight is 400 grams. The quality control inspector suspects that the average weight of packets is, in fact, mot this amount and institutes a survey to check these suspicions. In a random sample of 144 packets, the average weight is found to be 395 grams with a standard deviation of 14.2 grams. Test the hypothesis that the mean weight is 400 grams at the 5% level of significance and the 1% level of significance. State whether this result confirms the suspicions of the quality control inspector. © In a survey commissioned by a TV travel programme, 135 people were asked what their favourite foreign holiday destination was. Some of the results are given below: 28 Greece 4 3 Females Males 16 14 Spain Thailand Turkey USA Total 12 18 20 Use these sample results to test for an association between gender and destination preferences using a 5% level of significance. 10 10