So this table is all about showing you how to calculate the standard deviation in various steps.
Step 1: calculate the average (=mean) of the x values. You probably know how to do this, add all values and divide by the number of values. (53+51+48+49+37)/5 = 47.6. This is your .
Step 2: calculate . This is the "distance" of your x value to the average. This has been done for you already in the second column. E.g. 53-47.6=5.4.
Step 3: square the results of . This is also done for you already, it is the third column.
Step 4: Add (sum) the values. So add the third column. I get 155.2 when I do that.
Step 5: Divide that sum by the number of x values. 155.2/5 = 31.04 ≈ 31. That number is your variance right there!
Step 6: Take the square root of the variance. √31.04 ≈ 5.571 ≈ 5.6. This is your standard deviation.
0.072 is the correct answer
Answer:
C (because as the number of cups sold goes up, so does the profit) (and its not dots)
Step-by-step explanation:
D could be if they only sold one cup, but started with a profit already. (maybe mom payed THEM to start up the stand?)
30%.
6 nickels equal 30 pennies, and 100 pennies make up a dollar.
30/100 = 30%.
Answer:
2. 8 1/4
3.8 1/4
5. 5 1/10
6. 6 1/3
8. 10 1/6
9. 10 1/10
11. 3 1/8
12. 5 1/6
Step-by-step explanation:
Hope this helped :)