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Verizon [17]
2 years ago
5

The amounts spent by 5 students on back to school supplies are $28.50, $25.75, $23.60, $30.20, and $25.00. Jenny spends $41.13 f

or her supplies. If the amount Jenny spends is included in the data, how will the mean be affected?
A) The mean decreases by $3.55
B) The mean increases by $2.42.
C) The mean increases by $2.54.
D) The mean increases by $1.55.
Mathematics
1 answer:
expeople1 [14]2 years ago
5 0
Answer:
B) The mean increases by $2.42

Btw. My answer was $2.40… B was the closest
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Suppose the population standard deviation is σ = 5 , an SRS of n = 100 is obtained, and the confidence level is chosen to be 98%
beks73 [17]

Answer:

1.165.

Step-by-step explanation:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1-0.98}{2} = 0.01

Now, we have to find z in the Ztable as such z has a pvalue of 1-\alpha.

So it is z with a pvalue of 1-0.01 = 0.99, so z = 2.33

Now, find the margin of error M as such

M = z*\frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample.

In this problem, we have that:

\sigma = 5, n = 100. So

M = z*\frac{\sigma}{\sqrt{n}}

M = 2.33*\frac{5}{\sqrt{100}} = 1.165

So the correct answer is:

1.165.

6 0
3 years ago
simplify 4 square root of 2 end root plus 7 square root of 2 end root minus 3 square root of 2. 2 square root of 8 8 square root
Alex787 [66]

<u>Answer</u>

8√2


<u>Explanation</u>

Simply: 4√2 + 7√2 - 3√2

Let √2 = x

4√2 + 7√2 - 3√2 = 4x + 7x - 3x

                             = 11x - 3x

                             = 8x

Substituting x with √2

4√2 + 7√2 - 3√2 = 8√2

4 0
3 years ago
Read 2 more answers
Please help me with this one
Fantom [35]
The answer is f because it equals 1/3 and f is 1/3
5 0
2 years ago
Read 2 more answers
Can anyone please explain this to me​
Crazy boy [7]
What Grade even is this ..
5 0
3 years ago
If you were to fill a graduated cylinder to 150mL, then drop a metal object in that raises the water level to 250mL, what is the
fiasKO [112]

Answer:

100 mL

Step-by-step explanation:

Subtract 150 from 250 to get the answer, hope this helped!

4 0
3 years ago
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