Anew drug has been found to be effective in treating 75% of the people afflicted by a certain disease. if the drug is administered to 400 people who have this disease, what are the mean and the standard deviation of the number of people for whom the drug can be expected to be effective? (round your standard deviation to two decimal places.)

The mean is 300 and the standard deviation is 8.67.

Step-by-step explanation:

It has been given that the drug has been found to be effective in treating 75% of the people afflicted by a certain disease.

Therefore, probability of success is given by p = 0.75

Now, total number of people affecting from the disease, n = 400

We know the formula for mean, which is given by

And the standard deviation is

Therefore, the mean is 300 and the standard deviation is 8.67.

13.46

step-by-step explanation:

16.80 x .20 = 13.46