Approximate the standard deviation of age for males. I already know that the population mean is 42.56. By the way, we are subtracting vertically to get the midpoints (ex: 0+10/2=5, 10+20/2=15).

The average age of senators in the 108th Congress was 62 years. If the standard deviation was 12.5 years, find the z-scores corresponding to the oldest and youngest senators of age 86 and 46. Round z scores to two decimal places.

The number of gallons of paint that Home Depot sells in a given day is normally distributed with a mean of 219 gallons and a standard deviation of 27 gallons (I realize that the distribution is probably different for weekends compared to weekdays, but just assume everyday has the distribution). How many gallons of paint have to be sold in a given day in order for that day to be in the top 10% of the highest number of gallons sold? (please round your answer to 2 decimal places)

Human body temperatures have a mean of 98.20°F and a standard deviation of 0.62°F. Convert 103.00°F to a z-score and determine if it is usual or unusual. Unusual means that the z-score is more than two standard deviation's below or above the mean. Show work please!