9. A walk at 4 miles per hour burns an average of 300 calories per hour, If the standard deviation of the distribution is 8 calories, find the probability that a person who walks one hour at the rate of 4 miles per hour will burn the following calories. Assume the variable is normally distributed. Show all work and express your answers as a percentage rounded to two decimal places, a) More than 280 calories b) Less than 293 calories dot speed of fifth grade students ix approximately nonbill with words per minute and a standard deviation of 24 worda por mi g speed of a fifth-grader who reading speed is at the 90 ) Between 285 and 320 calories