Macmillan Learning Juan makes a measurement in a chemistry laboratory and records the result in his lab report. Suppose that if Juan makes this measurement repeatedly, the standard deviation of his measurements will be o = 15 milligrams. Juan repeats the measurement four times and records the mean x of his four measurements. What is the standard deviation of Juan's mean result? (That is, if Juan kept on making four measurements and averaging them, what would be the standard deviation of all his x's?) Round your answer to one decimal place. + standard deviation: How many times, n, must Juan repeat whole number. n= measureme to reduce the standard deviation of x to 3? Give your answer as a mg

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Macmillan Learning
80
Juan makes a measurement in a chemistry laboratory and records the result in his lab report. Suppose that if Juan makes this
measurement repeatedly, the standard deviation of his measurements will be o = 15 milligrams. Juan repeats the measurement
four times and records the mean x of his four measurements.
What is the standard deviation of Juan's mean result? (That is, if Juan kept on making four measurements and averaging them,
what would be the standard deviation of all his x's?)
Round your answer to one decimal place.
standard deviation:
How many times, n, must Juan repeat the measurement to reduce the standard deviation of x to 3? Give your answer as a
whole number.
n =
a
F5
F6
F7
DII
F8
F9
F10
F11
mg
F12
Transcribed Image Text:Macmillan Learning 80 Juan makes a measurement in a chemistry laboratory and records the result in his lab report. Suppose that if Juan makes this measurement repeatedly, the standard deviation of his measurements will be o = 15 milligrams. Juan repeats the measurement four times and records the mean x of his four measurements. What is the standard deviation of Juan's mean result? (That is, if Juan kept on making four measurements and averaging them, what would be the standard deviation of all his x's?) Round your answer to one decimal place. standard deviation: How many times, n, must Juan repeat the measurement to reduce the standard deviation of x to 3? Give your answer as a whole number. n = a F5 F6 F7 DII F8 F9 F10 F11 mg F12
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