Please help by explaining the concepts underlying how the following problem is solved

The distribution of bladder volume in men is approximately Normal with mean 550 milliliters (m1) and standard deviation 100 ml. In women, bladder volumes are approximately Normal with mean 400 m1 and standard deviation 75 ml. Refer to the plot of these two distributions and use the 6895993 rule to answer the questions. om- NIH-- lama-- um- lum- r ' -. m- _. _ , , .-. ..._...._... _ to 200 sou 400 500 all m 500 no Bladder Vdume (ml) (a) Between what volumes do the middle 95% of men's bladders fall? (Enter your answers as whole numbers.) (b) What percent of men's bladders have a volume larger than 650 ml? (Enter your answer as whole numbers.) (c) Between what values do almost all (99.7%) of women's bladder volumes fall? (Enter your answers as whole numbers.) (d) How small are the smallest 2.5% of all bladders among women