Answer:
4.0486
Step-by-step explanation:
The margin of error is calculated using 
Where n=60 is the sample size and 
is the population standard deviation.
The critical value corresponding to 95% confidence interval is 
We substitute the values to obtain;
Answer: each pen costed him 2 dollars
Explanation: 24 - 10 = 14
14 / 7 = 2 $ per each pen
Answer: 2 4/15 months
Step-by-step explanation:
From the question, we are informed that a wagon train traveled from Missouri to Wyoming in 1 2/3 months and from Wyoming to Utah in 3/5 month.
The number of months that it will take the wagon train to travel from Missouri to Utah will be:
= 1 2/3 + 3/5
The common lowest multiple is 15
= 1 10/15 + 9/15
= 1 19/15
= 1 + 1 4/15
= 2 4/15 months
It will take they train 2 4/15 months to travel from Missouri to Utah.
