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3 years ago

Help!How do you do this?

Mathematics

1 answer:

Fittoniya [83]3 years ago

6 0

recognise the paternes, remember this is a multiplication chart but with random multipliers, do this and you MIGHT be able to solve it

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PLEASE HELP What’s The Answer Of This?

nalin [4]

Answer:

da answer is

Step-by-step explanation:

3 0

2 years ago

A sample of 148 college students at a large university reports getting an average of 6.85 hours of sleep last night with a stand

nignag [31]

Answer:

70 students need to be surveyed.

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:

$\alpha = \frac{1 - 0.95}{2} = 0.025$

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

That is z with a pvalue of $1 - 0.025 = 0.975$ , so Z = 1.96.

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.

Assuming that the standard deviation of the above sample is a reasonable estimate of the standard deviation of sleep time at your university.

This means that $\sigma = 2.12$

How many students do you need to survey to estimate the mean sleep time of students at your university with 95% confidence and a margin of error of 0.5 hours?

n students need to be surveyed, and n is found when M = 0.5. So

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

$0.5 = 1.96\frac{2.12}{\sqrt{n}}$

$0.5\sqrt{n} = 1.96*2.12$

Multiplying by 2 on both sides:

$\sqrt{n} = 1.96*4.24$

$(\sqrt{n})^2 = (1.96*4.24)^2$

$n = 69.1$

Rounding up

70 students need to be surveyed.

3 0

2 years ago

Farrah’s math grade average is 93.3¯%. How can you represent this repeating decimal as a fraction?

nalin [4]

Answer:

Don't understand the question

4 0

2 years ago

How do you multiply letters

anyanavicka [17]

Answer: you don't multiply the letters, the letter means any number

EX: if there was an equasion like f x 43 276 the f would be 6 because 6x 43 =276 or 5 x 65 = x

Step-by-step explanation:

3 0

3 years ago

Greatest to least 0.04;0.5;0.021;1.33

vlada-n [284]

0.021;0.04;0.05;1.33

8 0

3 years ago