1a) A normal population has a mean μ = 31 and a standard deviation of 8. What proportion of the population is less than 29? b) A bottler of drinking water fills plastic bottles with a mean volume of...

1a) A normal population has a mean μ = 31 and a standard deviation of 8. What proportion of the population is less than 29?

b) A bottler of drinking water fills plastic bottles with a mean volume of 999 milliliters (mL) and a standard deviation of 7mL.  The fill volumes are normally distributed. What is the probability that a bottle has a volume greater than 992mL?

Please answer all parts a and b