MATHEMATICS HIGH SCHOOL

Can somebody PLEASE help meIn a SRS of 80 teenagers, the average number of text messages received per day is found to 50. If the standard deviation of number of texts received is known to be σ = 12, find the 95% confidence interval for the number of text messages received.

Answers

Answer 1
Answer: To solve this problem you have to find out what the value of +/- Z is that encloses 95% of the area under the normal distribution curve. For this you can use this formula: Please see the attached image.

Find the upper and lower limits of x, corresponding to +Z and -Z respective.

I hope this helps, Regards.

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14. An online file storage site offers a payment plan where users can pay for a year membership Intwelve equal payments. If Manny paid $7.95 per month, how much did he pay In full for the year?

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Answer: 95.4

Step-by-step explanation:

An employee worked 160.5 hours in may, 165.75 hours in June and 152.25 hours in july. What was the average number of hours you worked each month?

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To find the average, you have to add everything up and divide by the amount that you have. In this case, you need to add together 160.5, 165.75 and 152.25, and then divide by 3.
160.5+165.75+152.25= 478.5
You've then got to divide this by three.
478.5/3= 159.5
Therefore, the average hour worked each month bu the employee is 159.5
Hope this helps :) 

What is the slope of the line 4x + 6y = 12

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I believe its going to be (3,2) because you take 12 and divide it by 4 which gives you your x value of 3 then you take 12 and divide it by 6 which gives you your y value of 2
4x+6y=12
-4x        -4x
6y=-4x+12
-6          -6

Answer: Y= -4x+12

What is -5/8 + 3/4 ?

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Answer:

0.125

Step-by-step explanation:

"What value does the 5 have in 893.75?A.1 / 5

B.5 / 10

C.5 / 100

D.5 / 1000"

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I agree with the person above - the correct answer is C. 5 / 100
This is because 5 / 100 = 0.05 - so you see there are two digits after the comma
C. 5 / 100 hope this helps!

Whats 1+1 ita just to hard im trying but i can't figure it out​

Answers

Answer: 25

Step-by-step explanation:

because its funnier than 24.
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