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2 years ago

11

Sally's bake shop sells a box of brownies.Jonah divides the brownies amongst five friends.If each friend recieves 3 brownies,the

n how many brownies are in the box

1 answer:

Tasya [4]2 years ago

8 0

Answer:

15 brownies

Step-by-step explanation:

5 friends each have 3 brownies

you want to take 5 and multiply it by 3

5x3=15

15 brownies were in the box

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A professor records the difference between the marks scored by the students in the class test last week and those scored in the

dezoksy [38]

Answer: $(10.82\ , 13.18)$

Step-by-step explanation:

The confidence interval for population mean is given by :-

$\mu\pm\ z_{\alpha/2}\dfrac{\sigma}{\sqrt{n}}$

Given : Sample size : n= 35 , large sample (n>30)

Mean difference : $\overline{x}=12$

Standard deviation : $\sigma=3$

Significance level : $\alpha=- 1-0.999=0.001$

Critical value : $z_{\alpha/2}=z_{0.0005}=3.4807567$

Now, the 99.9% confidence interval for the mean difference between the marks scored last week and marks scored this week by all the students will be :-

$12\pm\ (3.4807567)\dfrac{2}{\sqrt{35}}\\\\=12\pm1.18\\\\=(10.82\ , 13.18)$

Hence, the 99.9% confidence interval for the mean difference between the marks scored last week and marks scored this week by all the students = $(10.82\ , 13.18)$

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Frank has a batting average of .255. Write this decimal as a fraction in simplest form.

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