Question

14. What is wrong with the following grouped frequency distribution?GradesFrequency50-55255-60460-70970-801580-90790 and above4The classes do not all have the same widthThere are open-ended classesThe classes overlapAll of the above

Answer 1

First we notice that some intervals have width 5 an other width 10. We also notice that the last interval is open ended; futhermore we notice that the intercal overlap, for example, the first interval finish at 55 and the second starts at the same point then they overlap.

Therefore the answer is all of the above.