Answer:
s = 19.7
Step-by-step explanation:
First we need to calculate the mean x' of the sample as:

We sum all the scores and divide them by the number of scores.
Then, the standard deviation s is calculated as:

We square every score less the mean, sum every value, then divide that by the number of scores less 1 and finally, we calculate the square root.
So, the standard deviation of the sample is 19.7
Answer:
Step-by-step explanation:
Amy = x years
Ben = x + 2 (years)
Alice = x - 6 (years)
Answer:
the answer is 32cm squared
Step-by-step explanation:
25. To go from 2 to 6 you add 4 to the previous term. 2+4=6 6+4=10 10+4=14 14+4=1825.
It will take 16 seconds.. (3 to 4) (6 to 8) (9 to 12) (12 to 16)