Mean and Standard Deviation

Which of the following symbols

represents the mean of a set

of numbers?

Xi

Xbar

σ

Which of the following symbols represents the

Standard Deviation of a set of numbers?

Xi

Xbar

σ

Find Xbar for following set of numbers:

 

47, 27, 31, 24, 47

 

If necessary, round to the nearest tenth.

 

 

Xbar=

Find ∑(Xi-Xbar)2 for the following set of numbers

 

47, 27, 31, 24, 47

 

If necessary, round to the nearest tenth.

 

Xbar=35.2

 

∑(Xi-Xbar)2 =

Find the σ for the following set of numbers:

 

47, 27, 31, 24, 47

 

If necessary, round your answer to the nearest tenth.

 

Xbar=35.2

∑(Xi-Xbar)2=488.8

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