Question

The fluctuation in power (in W) in a microlamp was measured five times. The measured values were 59.63, 60.`4, 59.66, and 59.85. Find the standard deviation and variance for the data. Round the results to the nearest thousandth as needed.

Answer 1

http://www.mathsisfun.com/data/standard-deviation.html

Answer 2

The mean is\[\frac{ 59.63+ 60.04+ 59.66+ 59.85}{4}=59.795\]

Answer 3

The standard deviation is?? The variance is???

Answer 4

Read the link!Standard Deviation
The Standard Deviation is a measure of how spread out numbers are.

Its symbol is σ (the greek letter sigma)

The formula is easy: it is the square root of the Variance. So now you ask, "What is the Variance?"

Variance
The Variance is defined as:

The average of the squared differences from the Mean.

To calculate the variance follow these steps:

Work out the Mean (the simple average of the numbers)
Then for each number: subtract the Mean and square the result (the squared difference).
Then work out the average of those squared differences. (Why Square?)

Answer 5

What???

Answer 6

If you don't get something, say immediately without waiting 5 minutes.

-Do you know what a mean is?
-Do you know how to calculate it?
-For a certain value that you have measured, do you know how to calculate the difference between the mean and that value?

Answer 7

what?

Answer 8

Do you know what a mean is?