statistic problem! how to creat a relative frequency histogram?

Question

1. Thirty members of the International Society of Out-of-the-Closet Philatelists were drawn at random from the Society’s published directory, and the ages of these members were found to be:

6, 8, 12, 13, 15, 17, 21, 24, 25, 26,
30, 30, 32, 36, 39, 44, 45, 49, 49, 52,
56, 59, 62, 62, 62, 70, 75, 77, 80, 85


(b) Separate these data into classes (say 6 – 10 in number) and construct a histogram based on the frequencies of the ages in each class.

(c) Construct a stem and leaf plot of the above data. Note the resemblance between this plot and your histogram.

(d) Now, assume that the data had been summarized by your histogram in part (b) and that the original data had been lost. Calculate the mean and standard deviation of the grouped data, as given in your answer to part (b), and comment on the quality of these approximations to the mean and standard deviation of the original data.

Answer 1

It's easy man. All you want to do is create a histogram and use relative frequencies (percentages) for the frequencies instead of the numbers themselves. Recall that to find the relative frequency of a particular value all you need to do is divide the class frequency by the sum of all the frequencies. Then you just convert the decimal you get by multiplying that number by 100 and adding "%".That gives you the percentage for that class. This is assuming you already know how to create a histogram of course, and if you don't I unfortunately can't go into that right now because that would require taking another Adderall and I'm trying to get tired and go to bed so I can get up and (ironically) study for my statistics exam tomorrow.

Answer 2

Back to your teacher. You have not understood the basics of statistical representation.

Answer 3

oops! i dont hav the time to read such a long question