I have difficulties in solving this question. if possible, please help me out! thanks!!

The time in minutes that an adult male takes to burn off 5 grams of fat if walking at a steady pace is normally distributed with a mean, μ, equal to 25 minutes and a standard deviation, σ, equal to 5 minutes.Remember to draw diagrams.

a. What proportion of adult males walking at a steady pace take between 26 minutes and 29 minutes to burn off 5 grams of fat?

b. In a random sample of 30 adult males walking at a steady pace what is the probability that the mean time to burn off 5 grams of fat is less than 23 minutes?

c. An adult male is classified as having a slow metabolism if the time taken to burn off 5 grams of fat while walking at a steady pace is in the top 5% of times. What is the cut‐off time for an adult male walking at a steady pace to be classified as having a slow metabolism? Give your answer to the nearest minute.

d. A sport physiologist suggests that 10% of adult males walking at a steady pace can burn off 5 grams of fat in less than 20 minutes. What is the probability that in a random sample of 100 adult males walking at a steady pace less than 8 of them can burn off 5 grams of fat in less than 20 minutes?