Expert: Ahmed Salami - 11/30/2004

Question
I have a set of numbers: 69,70,72,73,75,76,76,77,80,82.

I am to find the standard deviation for this data set and I am also suppose to find the five-number summary for this data also. My only problem is I have no idea how to find either of these and I have no clue as to what the answer would be. Can you please help me?

Answer
Hi Alan,
Really sorry for the delay, i am having my exams and project study.
To find the standard deviation, you find the mean of the data. Substract the mean from each value and square before adding all, divide by the number of data and then find the square root.
I'm afraid i do not have enough time to do it all for you. As for the 5-number summary, In descriptive statistics, the five-number summary of a data set consists of:

the minimum (smallest observation)
the lower quartile or first quartile (which cuts off the lowest 25% of the data)
the median (middle value)
the upper quartile or third quartile (which cuts off the highest 25% of the data)
the maximum (largest observation)

Sorry for the delay and any mix up. You can always get back to me.
Regards.