A large company in Limpopo purchases a certain kind of computer device from a local manufacturer. The manufacturer point out that the defective rate of this computer device is 3%. a) If the well trained inspector randomly select 20 items from a batch. What is the probability that at least one defective item will be among these 20? b) If the retailer receives 10 batches in a week and the well-trained inspector chooses to randomly tests 20 of these computer devices per batch. What will be the probability that there is exactly 3 batches each having at least one defective device among the 20 that are carefully chosen and tested from the batch?
A large company in Limpopo purchases a certain kind of computer device from
a local manufacturer. The manufacturer point out that the defective rate of this
computer device is 3%.
a) If the well trained inspector randomly select 20 items from a batch. What is the
probability that at least one defective item will be among these 20?
b) If the retailer receives 10 batches in a week and the well-trained inspector
chooses to randomly tests 20 of these computer devices per batch. What will
be the probability that there is exactly 3 batches each having at least one
defective device among the 20 that are carefully chosen and tested from the
batch?
2. Suppose that 10 is the average number of petrol tankers arriving in each day
at a petrol garage in Mankweng. The storage facilities at this garage can only
handle at most 15 tankers each day. Calculate the probability that in a given
day tankers should be turned away.
3. In a certain hardware facility in Turfloop, accidents or injuries occur rarely.
Suppose that Mr Ngobeni, a store manager, knowns that the probability of an
injury occurring to his workers on any given day is 0.005 and that injuries are independent to each other
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