What is the standard deviation of the following data set rounded to the nearest tenth? 56 ,78 ,123 , 34, 67, 91, 20

The standard deviation of the following data set is 32.2

Step-by-step explanation:

step 1

Find the mean

we have

Sum the data and divided by the number of elements

step 2

For each number: subtract the Mean and square the result

step 3

Work out the mean of those squared differences

This value is called the "Variance"    

step 4

Take the square root of the variance

0.16 or 16%

step-by-step explanation:

lets take a coin for example.

if you toss it twice, it has a 1/4 chance of landing on heads both times because 1/2 * 1/2 is 1/4.

with the cards, the chance of picking dog is 0.4. having two people pick one is like picking a card twice in a row. so 0.4 * 0.4 is 0.16, or 16%

i think it might be a but you might want a second opinion