How many students must be randomly selected to estimate the mean weekly earnings...

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misochan

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How many students must be randomly selected to estimate the mean weekly earnings of students at one​ college? We want​ 95% confidence that the sample mean is within ​$22
of the population​ mean, and the population standard deviation is known to be ​$1818.




The graph depicts IQ scores of​ adults, and those scores are normally distributed with a mean of 100 and a standard deviation of 15​ (as on the Wechsler​ test).Find the indicated IQ score. Round your answer to nearest tenth.
The shaded area under the curve is 0.10.​



I have other problems too, but I didnt want to post a lot on one post :(
Are we able to post the worksheet on the forum?
 
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misochan said:
How many students must be randomly selected to estimate the mean weekly earnings of students at one​ college? We want​ 95% confidence that the sample mean is within ​$22
of the population​ mean, and the population standard deviation is known to be ​$1818.

The graph depicts IQ scores of​ adults, and those scores are normally distributed with a mean of 100 and a standard deviation of 15​ (as on the Wechsler​ test).Find the indicated IQ score. Round your answer to nearest tenth.
The shaded area under the curve is 0.10.​
Click to expand...
Are these two separate questions? For the second one, "the graph" didn't transfer with the rest of your copy-n-paste.

For each of these, what are your thoughts? What have you tried? How far have you gotten? Where are you stuck?

Please be complete. Thank you! ;)
 
misochan said:
How many students must be randomly selected to estimate the mean weekly earnings of students at one​ college? We want​ 95% confidence that the sample mean is within ​$22
of the population​ mean, and the population standard deviation is known to be ​$1818.




The graph depicts IQ scores of​ adults, and those scores are normally distributed with a mean of 100 and a standard deviation of 15​ (as on the Wechsler​ test).Find the indicated IQ score. Round your answer to nearest tenth.
The shaded area under the curve is 0.10.​



I have other problems too, but I didnt want to post a lot on one post :(
Are we able to post the worksheet on the forum?
Click to expand...

Is that correct?!
 
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