(1 point) Juan makes a measurement in a chemistry laboratory and records the result in his...

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(1 point) Juan makes a measurement in a chemistry laboratory and records the result in his...

(1 point) Juan makes a measurement in a chemistry laboratory and records the result in his lab report. The standard deviation of students' lab measurements is σ = 13 milligrams. Juan repeats the measurement 7 times and records the mean x⎯⎯⎯ of his 7 measurements.

A. How many times must Juan repeat the measurement to reduce the standard deviation of x(bar) to 3.25?

please explain as you go down!!

math Statistics-And-Probability

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