100,000 randomly selected adults were asked whether they drink at ...

[james0929]

100,000 randomly selected adults were asked whether they drink at least 48 oz of water each day and only 45 said yes. Identify the sample and population.
 
  A) Sample: the 45 of adults who drink at least 48 oz of water; population: all adults
  B) Sample: the 100,000 selected adults; population: the 45 of adults who drink at least 48 oz of water
  C) Sample: all adults ; population: the 100,000 selected adults
  D) Sample: the 100,000 selected adults; population: all adults

Question 2

Lengths of pregnancies are normally distributed with a mean of 268 days and a standard
  deviation of 15 days. (a) Find the probability of a pregnancy lasting more than 250 days.
  (b) Find the probability of a pregnancy lasting more than 280 days.
 
  Draw the diagram for
  each and discuss the part of the solution that would be different to finding the requested
  probabilities.

[braelync]

Answer to Question 1

D

Answer to Question 2

Both (a) and (b) are solved by subtracting the area score from 1.

[james0929]

Thank you!

[braelync]

Always glad to help...