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3 years ago

Which percentage is the right answer

Mathematics

1 answer:

givi [52]3 years ago

3 0

This is a bad question.

The real answer is any of them may be the actual percentage, the true population mean. Probability and statistics often don't rule events out entirely; they just tell us some events are very unlikely. For example here all we know is there's a 95% chance the true percentage is within $78\% \pm 8\%$ . But there's a 5% chance it isn't, so those other percentages are still possible.

The question seems to want to ask which percentage falls within the 95% confidence interval. That's between 78-8=70% and 78+8=86% so the answer is

Answer: C 72%

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To get a b in math, alexandria pappas must average 80 on five tests. scores on the first four tests were 8484, 7575, 8181, a

Grace [21]

Answer: 84

Explanation:

Total for 5 tests = 80 x 5 = 400

Total for 4 tests = 84 + 75 + 81 + 76 = 316

5th score = 400 - 316 = 84

5 0

3 years ago

write an expression that represents the cost of one carful of nonstudents ($12 per person). Use x as the number of people who ri

gayaneshka [121]

Okay so each person is $12

Then you need to times that for how many people are in the car x.

Since x is a variable and not a number it can go right next to the 12

You answer should be 12x

7 0

4 years ago

Don't spam...<br><br>Step by step explaination needed...

Anastasy [175]

Answer:

$\:$

Step-by-step explanation:

Given polynomial :

f(x) = 2x³–5x² + 5x

Let the number to be subtracted be n

(x is already in equation so, n is better)

since, 2x – 3 factor given

→

$f ( \frac{3}{2} ) = 0$

So,

$2x {}^{3} - 5x {}^{2} + 5 {x}^{2} - n$

$2x {}^{3} - 5x {}^{2} + 5x - n = 0 \\ \\ 2( \frac{3}{2} ) {}^{3} - 5( \frac{3}{2} ) {}^{2} + 5( \frac{3}{2} ) - n = 0 \\ \\ 2 \times \frac{27}{8} - 5 \times \frac{9}{4} + 5 \times \frac{3}{2} - n \: = 0 \\ \\ \frac{27}{4} - \frac{45}{4} + \frac{15}{2} - \frac{n}{1} = 0 \\ \\ 27 - 45 + 30 - 4n = 0 \\ \\ 12 - 4n \: = 0 \\ \\n = \frac{ - 12}{ - 4} \\ \\ n = > 3$

4 0

3 years ago

Read 2 more answers

What is 8b2 - 8 factored?

erma4kov [3.2K]

Answer:

8 • (b + 1) • (b - 1)

Step-by-step explanation:

Reformatting the input :

Changes made to your input should not affect the solution:

(1): "b2" was replaced by "b^2".

Step by step solution :

Step 1 :

Equation at the end of step 1 :

23b2 - 8

Step 2 :

Step 3 :

Pulling out like terms :

3.1 Pull out like factors :

8b2 - 8 = 8 • (b2 - 1)

Trying to factor as a Difference of Squares :

3.2 Factoring: b2 - 1

Theory : A difference of two perfect squares, A2 - B2 can be factored into (A+B) • (A-B)

Proof : (A+B) • (A-B) =

A2 - AB + BA - B2 =

A2 - AB + AB - B2 =

A2 - B2

Note : AB = BA is the commutative property of multiplication.

Note : - AB + AB equals zero and is therefore eliminated from the expression.

Check : 1 is the square of 1

Check : b2 is the square of b1

Factorization is : (b + 1) • (b - 1)

Final result :

8 • (b + 1) • (b - 1)

7 0

4 years ago

A movie theater charges $8.00 for adults and $5.00 for children. If there were 40 people altogether and the theater collected $2

Rainbow [258]

Answer:

C.24

Step-by-step explanation:

First multiply 8 by 24 this is so you know how much 24 adults would be. You will get 192 so next you need to subtract 192 from the total money 272 to get 80 and 80 should be how much all of the kids cost now to check and make sure there are 40 people divide 80 by 5 to get 16 which is the total number of kids no just add 16 and 24 together to get 40

6 0

3 years ago