Answer: 0.6065
Step-by-step explanation:
Given : The machine's output is normally distributed with


Let x be the random variable that represents the output of machine .
z-score : 
For x= 21 ounces

For x= 28 ounces

Using the standard normal distribution table , we have
The p-value : 

Hence, the probability of filling a cup between 21 and 28 ounces= 0.6065
First set up a proportion
240/160 = 320/200
Cross multiply and if the left equals the right it is similar.
The sum of 3 fifteens and 4 twos will be 45 +8 = 53
AL=5ah!!!!!!!!!! Hope it helps