How many tutors does the academy need if it has 120 students ?

Assume that the weights of quarters are normally distributed with a mean of 5.67 g and a standard deviation 0.070 g. a vending machine will only accept coins weighing between 5.48 g and 5.82 g. what percentage of legal quarters will be rejected? round your answer to two decimal places.

An ant travels at a constant rate of 30cm every 2 minutes. at what speed does the ant travel per minute

In a sale there is 25% of all prices a chair costs £45 in sale how much was it before the sale