First, we get the standard error of the mean using
σm = σ / √N
= 5 / √100
= 0.5
Next, we subtract and add 1.96 standard deviations from the mean (since the confidence interval is 95%). So,
8 ±1.96 (0.5)
= 8 <span>± 0.98
The answer is
</span>E) 8±0.98
X method is the method to find the factors of the polynomial equation.The factor of the given polynomial is,

Thus the option 3 is the correct option,
<h3>
How to find factor of polynomial using X method?</h3>
X method is the method to find the factors of the polynomial equation.
The standard form of the quadratic equitation is given as,

Given information-
The equation given in the problem is,

Compare the above equation with the standard form. We get,

To find out the factor of above equation using X method, follow the steps.
- Step 1) Multiply
and
and place
at the top of X as shown in the image.

- Step 2) Place
at the bottom as shown in the image below.

- Step 3) Find two numbers that multiply the top number
and to the bottom number
.
- Step 4) Write the polynomial from the X box as,


Hence the factor of the given polynomial is,

Thus the option 3 is the correct option,
Learn more about the X method here;
brainly.com/question/24379507
Answer:
(D) 26
Step-by-step explanation:
(10+6+x)/3=14
16+x=42
x=26
So the third number is (D) 26