3. The probability of a telesales representative making a sale on a customer call is 0.15
Find the probability that
- no sales are made in 10 calls,
- more than 3 sales are made in 20 calls.
Representatives are required to achieve a mean of at least 5 sales each day.
- Find the least number of calls each day a representative should make to achieve this requirement.
- Calculate the least number of calls that need to be made by a representative for the probability of at least 1 sale to exceed 0.95