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3 years ago

I need to know the answer

Mathematics

2 answers:

Firdavs [7]3 years ago

8 0

It would be 115

180-65 = 115 and 180 comes from the straight line which is half of 360

Alona [7]3 years ago

7 0

The answer would be 115.

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Randomly selected students participated in an experiment to test their ability to determine when one minute (or sixty seconds)

zalisa [80]

Answer: $(57.41,\ 62.19)$

Step-by-step explanation:

Given : Sample size : $n=40$

Sample mean : $\overline{x}=59.8\text{ seconds}$

Standard deviation : $\sigma =9.2\text{ seconds}$

Significance level : $\alpha=1-0.9=0.1$

Critical value : $z_{\alpha/2}=1.645$

Formula to find the confidence interval for population mean :-

$\overline{x}\pm z_{\alpha/2}\dfrac{\sigma}{\sqrt{n}}\\\\=59.8\pm(1.645)\dfrac{9.2}{\sqrt{40}}\\\\\approx59.8\pm2.39\\\\=(59.8-2.39,\ 59.8+2.39)\\\\=(57.41,\ 62.19)$

Hence, a 90% confidence interval estimate of the population mean of all students = $(57.41,\ 62.19)$

6 0

3 years ago

Help fast please....

Leya [2.2K]

Answer:

We need the question to answer plz.

Step-by-step explanation:

lol

4 0

2 years ago

Two brothers, Gethin and David, share a sum of money in the ratio 2:7.

Vitek1552 [10]

12£ and 42£

Step-by-step explanation:

gethin gets 2/9

David gets 7/9

total money is equal to 54

Gethin gets 54x 2/9=12

David gets 54x7/9=42

4 0

3 years ago

You buy 3.16 pounds of pears, 1.45 pounds of oranges, and 2.62 pounds of peaches. What is your total bill?

pentagon [3]

Answer:

$8.46

Step-by-step explanation:

pears = $3.76

oranges = $1.58

peaches = $3.12

(i believe this is correct but I am not 100% sure)

3 0

3 years ago

My nephew, Oliver, got a new Lego set. He has decided to build it with his friend, Josie. It took them 6 hours to build together

Usimov [2.4K]

Answer:

4 hours

Step-by-step explanation:

If it took them together with a total of 6 hours and Oliver is half as fast meaning Jose is faster it will take Jose 4 hours.

A simple equation is

6= 4+2

And the 2 would be Oliver since Oliver is half as fast.

7 0

2 years ago