How do you know how many units are spread between the intervals? (For instance, 120-129, 130-139, units spread by 10)
How would we answer this question?
Thirty AA batteries were tested to determine how long they would last. The results, to the nearest minute, were recorded as follows:
423, 379, 387, 411, 393, 394, 371, 377,389, 409, 392, 408, 429, 401, 373, 391, 405, 382, 400, 381, 399, 415, 428, 422,396, 372, 410, 419, 386,390
a) Display the data using a frequency table with CLASS intervals.
Can someone help out, thanks!
Range = 371-429 = 58
If you have 10-point intervals, you will have about 6 intervals.
Start with 170-179 and end with 420-429.
Calculate the frequency within each interval.