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2 years ago

The sum of a number b and 7.5 is 4.8

1 answer:

8 0

B + 7.5 = 4.8
-7.5 -7.5
-----------------------
b = -2.7

Hope this helps!!!!!

You can also check your answer by doing replacing the number with the variable ( don't just write the anwser just because you know it, since its pre algebra you have to do it algebraically like above)

-2.7 + 7.5 = 4.8

Hope it helps!

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Stephen makes a buleberry pie and cuts it into 6 slices.He eats 1/3 of the pie over the weekend. How many slices of pie does Ste

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Since there were 6 slices, and he ate 1/3, 6*1/3= 2, so he ate 2 slices

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2 years ago

Suppose that a random sample of 10 adults has a mean score of 62 on a standardized personality test, with a standard deviation o

aniked [119]

Answer:

The 90% confidence interval for the mean score of all takers of this test is between 59.92 and 64.08. The lower end is 59.92, and the upper end is 64.08.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.9}{2} = 0.05$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.05 = 0.95$ , so $z = 1.645$

Now, find the margin of error M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

$M = 1.645*\frac{4}{\sqrt{10}} = 2.08$

The lower end of the interval is the sample mean subtracted by M. So it is 62 - 2.08 = 59.92

The upper end of the interval is the sample mean added to M. So it is 62 + 2.08 = 64.08.

The 90% confidence interval for the mean score of all takers of this test is between 59.92 and 64.08. The lower end is 59.92, and the upper end is 64.08.

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2 years ago

Kara has four boy cousins and three girl cousins. Write a fraction to represent the part of her cousins that are girls.

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Answer:

it would be 3/7

Step-by-step explanation:

3+4=7 3 cousins out of the seven are girls

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3 years ago

18 ÷ (6 + 1 - 1) + 2 =

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Answer:

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2 years ago

BRAINLIEST

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Answer:

that would be b

Step-by-step explanation:

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2 years ago