Answer:
A=-7
Step-by-step explanation:
The arithmetic formula is expressed as an = a1 + d *(n-1)where n is an integer. Substituting from the given a1 = -12 and a27 = 66, 66 = -12 + d *(27-1). hence , d is equal to 3. a42 thus using the formula is equal to 111. The final answer to this problem is 111.
Answer:
The margin of error for a 99% confidence interval was of $1.84.
Step-by-step explanation:
We have that to find our level, that is the subtraction of 1 by the confidence interval divided by 2. So:
Now, we have to find z in the Ztable as such z has a pvalue of .
So it is z with a pvalue of , so
Now, find the margin of error M as such
In which is the standard deviation(square root of the variance) and n is the size of the sample. In this question,
So
The margin of error for a 99% confidence interval was of $1.84.
sorry i cant solve this problem
maybe next time
hope you understand me!
The answer is a hope it helps you out