In my opinion I think that it would be 15cm
Anything in absolute value signs like this |-1| is positive so it would be positive 1 instead of negative. For instead question one is -1. Hope this helps you!
Answer:
The sample size is 
Step-by-step explanation:
The population proportion is 
The margin of error is 
From the question we are told the confidence level is 90% , hence the level of significance is
=>
Generally from the normal distribution table the critical value of
is
Generally the sample size is mathematically represented as
=>
=> 
an eight pack because you get more water and its cheaper that way