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Delvig [45]
3 years ago
12

To build a computer, Tom needs to buy a motherboard for £ 120, and a CPU for

Mathematics
1 answer:
maksim [4K]3 years ago
7 0

Answer:

£2200

Step-by-step explanation:

1 computer = £120 + £100

1 computer = £220

10 computers = £220 x 10

10 computers = £2200

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Please help me asap I need it thanks
Evgesh-ka [11]

Answer: I think (3) is it

Step-by-step explanation:

8 0
3 years ago
You are competing in a foot race. You are at point B (8,5) and the finish line is at point A (-5,5) how far are you?
ra1l [238]

Answer:

13

Step-by-step explanation:

-5+x=8

isolate the x by moving the adding -5 to both sides

x=13

3 0
3 years ago
The legs of a right triangle measure 6 inches and 9 units. If theta is the angle between the 6-inch leg and the hypotenuse, sin
Alex73 [517]
I got 0.55 when I did this problem. If I am wrong I am so sorry and please correct me.
4 0
3 years ago
Read 2 more answers
A random sample of 85 sixth-graders in a large city take a course designed to improve scores on a reading comprehension test. Ba
BartSMP [9]

Answer:

12.6 < \mu < 14.8

For this case we can find the margin of error like this:

ME= \frac{14.8-12.6}{2}= 1.1

Since we need to divide the width of the interval by 2.

And now with the margin of error we can find the sample mean with any of the two following ways:

12.6 +1.1=13.7

14.8-1.1=13.7

So for this case the correct answer would be:

A. Sample Mean = 13.7; Margin of Error = 1.1

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".  

The margin of error is the range of values below and above the sample statistic in a confidence interval.  

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".  

Solution to the problem

The confidence interval for the mean is given by the following formula:  

\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}} (1)  

In order to calculate the critical value t_{\alpha/2} we need to find first the degrees of freedom, given by:  

df=n-1=85-1=84

We know that the confidence interval is given by:

12.6 < \mu < 14.8

For this case we can find the margin of error like this:

ME= \frac{14.8-12.6}{2}= 1.1

Since we need to divide the width of the interval by 2.

And now with the margin of error we can find the sample mean with any of the two following ways:

12.6 +1.1=13.7

14.8-1.1=13.7

So for this case the correct answer would be:

A. Sample Mean = 13.7; Margin of Error = 1.1

3 0
3 years ago
Using set notation;
Lostsunrise [7]

Answer:

25.

Step-by-step explanation:

The number of women employed = 100 - 65 = 35.

So the number of men paid weekly = 60 - 35

= 25.

5 0
3 years ago
Read 2 more answers
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