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bonufazy [111]
3 years ago
11

Whats the answer please help

Mathematics
1 answer:
lbvjy [14]3 years ago
8 0
The answer would be 6.
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A bag contains 3 red pens 5 blue pens and 2 black pens a pen is selected at random and is not replaced what is the probability o
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Answer: 1/6

Step-by-step explanation:

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2 years ago
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PLEASE HELP
lozanna [386]
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A simple random sample of 100 observations was taken from a large population. The sample mean and the standard deviation were de
olga2289 [7]

Answer:

Se=1.2

Step-by-step explanation:

The standard error is the standard deviation of a sample population. "It measures the accuracy with which a sample represents a population".

The central limit theorem (CLT) states "that the distribution of sample means approximates a normal distribution, as the sample size becomes larger, assuming that all samples are identical in size, and regardless of the population distribution shape"

The sample mean is defined as:

\bar X =\frac{\sum_{i=1}^n x_i}{n}

And the distribution for the sample mean is given by:

\bar X \sim N(\mu,\frac{\sigma}{\sqrt{n}})

Let X denotes the random variable that measures the particular characteristic of interest. Let, X1, X2, …, Xn be the values of the random variable for the n units of the sample.

As the sample size is large,(>30) it can be assumed that the distribution is normal. The standard error of the sample mean X bar is given by:

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

If we replace the values given we have:

Se=\frac{12}{\sqrt{100}}=1.2

So then the distribution for the sample mean \bar X is:

\bar X \sim N(\mu=80,Se=1.2)

5 0
2 years ago
a small theater has eight rows of 22 chairs each. there is a plan to add four chairs to each row. how many chairs will be in the
HACTEHA [7]
All you do is multiply 22 times 8 which is 176 then you multiply 8*4
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A dance school has 63 ballet dancers a 42% of the total number of dancers in the score ballet dancers what is the total number o
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42% of what is 63

0.42x = 63
x = 63/0.42
x = 150

There are 150 dancers in the school
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3 years ago
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