AQA S1

I am revising for statistics and doing revision questions. Can you help me with this question please.
63 62 60 67 49 65 70 58 57 52 54 55 56 64 61 62 59 57 56 58

Count the number of marks which are within the range (mean -St. dev, mean + st. dev), and express this as a percentage of all the marks.

you dont have to give me the answer, i found the mean and st dev. what is next? thank you

Okay - what is the range? You've found what you need to calculate it and you're told how to calculate it in the question.

Now with the range you can do the rest of the question.

63 62 60 67 49 65 70 58 57 52 54 55 56 64 61 62 59 57 56 58

Count the number of marks which are within the range and express this as a percentage of all the marks.

The bit you need of your question

10.1? right?

Hmm. How did you get there? I think you're making it a bit more complicated than it needs to be .

How many of those 20 numbers lie in that range?

The Range is 54.2,64.3

63 62 60 67 49 65 70 58 57 52 54 55 56 64 61 62 59 57 56 58

Okay. Consider 63. Is it in the range? Well, it's between 54.2 and 64.3 so yes it is. That is 1 number so far (maybe get a tally going or circle each number)

Now think about 62. Is it in the range?

Keep working your way right through the list.

Count the number of marks which are within the range (mean -St. dev, mean + st. dev), and express this as a percentage of all the marks.