A hint to get started
Solve a rejection probability and then model accepted cartons
In a carton of apples, a sample of 8 apples is taken and examined for spoilt apples.
(i) State, in context, an assumption for the number of spoilt apples in the sample to be modelled by a binomial distribution. mark
The number of spoilt apples in a random sample of size 8 may be modelled by the distribution . If at least 2 apples in a sample are found to be spoilt, the carton is rejected. It is known that the probability of a carton being rejected is 0.04.
(ii) Write down an equation satisfied by and find the value of . marks
(iii) 60 cartons of apples are loaded onto a lorry. Find the probability that more than 56 cartons loaded onto the lorry are not rejected. marks
[2013/HCI/6(modified)]
CJC · Review Problems · Question 5
Separate an individual apple being spoilt from a whole carton being rejected.