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leonid [27]
3 years ago
7

850 tens equals how many thousand

Mathematics
1 answer:
aniked [119]3 years ago
6 0
Well, all you have to do to solve this is multiply 850 times 10, which is 8,500, so that means there are 8 thousands.
PLEASE choose my answer as the Brainliest, as I have explained my answer well, and I am REALLY close to ranking up!
THANK YOU AND I HOPE I HELPED! =D 
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3(4a + 5) - 6a. Please answer this question if correct I will mark brainest.
mr Goodwill [35]

Answer:

6a + 15

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
A researcher reports survey results by stating that the standard error of the mean is 25 the population standard deviation is 40
bezimeni [28]

Answer:

a) A sample of 256 was used in this survey.

b) 45.14% probability that the point estimate was within ±15 of the population mean

Step-by-step explanation:

This question is solved using the normal probability distribution and the central limit theorem.

Normal probability distribution

When the distribution is normal, we use the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

Central Limit Theorem

The Central Limit Theorem estabilishes that, for a normally distributed random variable X, with mean \mu and standard deviation \sigma, the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean \mu and standard deviation s = \frac{\sigma}{\sqrt{n}}.

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

a. How large was the sample used in this survey?

We have that s = 25, \sigma = 400. We want to find n, so:

s = \frac{\sigma}{\sqrt{n}}

25 = \frac{400}{\sqrt{n}}

25\sqrt{n} = 400

\sqrt{n} = \frac{400}{25}

\sqrt{n} = 16

(\sqrt{n})^2 = 16^2[tex][tex]n = 256

A sample of 256 was used in this survey.

b. What is the probability that the point estimate was within ±15 of the population mean?

15 is the bounds with want, 25 is the standard error. So

Z = 15/25 = 0.6 has a pvalue of 0.7257

Z = -15/25 = -0.6 has a pvalue of 0.2743

0.7257 - 0.2743 = 0.4514

45.14% probability that the point estimate was within ±15 of the population mean

3 0
3 years ago
32/100 simplest form
trapecia [35]

Answer:

8/25 is the simplest form

4 0
2 years ago
Factor each completely
vampirchik [111]
Answer:
C
You have to do it step by step
x•x-5x+6x-30
6 0
3 years ago
Evaluate 2.625-(-6)
Lunna [17]
2,625 - (-6) = 

= 2, 625 + 6 

= 8, 625
8 0
3 years ago
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