Answer:
dont know
Step-by-step explanation:
No because the number 7 repeats no x-values can repeat.
Answer:
The margin of error is 
Step-by-step explanation:
From the question we are told that
The number of student is 
The highest amount is
$200
The lowest amount is
$75
The sample mean is
&140
The Standard deviation of this set is mathematically evaluated as

Substituting values


The margin of error (ME) is mathematically evaluated as

Where
is the critical value for
i.e the significance level
From the critical value table this is
So


The second one is the answer