#Please give an explanation

The average mass of one-week old puppies is normally distributed with a mean mass of 6 kg and a standard deviation of 1.1 kg.

If a puppy is selected at random:

a) What is the probability that its mass is more than 6.8 kg?

b) What is the probability that its mass is between 5.3 kg and 6.8 kg?

Express your answer in decimal form correct to 4 decimal places. If the last decimal(s) is(are) zero, write the zero(s) so that the number of decimals always remains 4. For example, 0.1111.