X:60,62,65,64,63,61,66,65,70,68,63,62,64,69,65,64,66,67,66,64.Find X,which exceeded 10%,50%,90%

Question

please answer me fast

Answer 1

When the data are ordered we can see that the range of X is 60 to 70. The data frequency peaks at 64 (4 values of X), and X=60, 61, 67, 68, 69, 70 have a frequency of one. The distribution of data (histogram) represents a bell curve. The median is at 64.5 and the mean at 64.7. The size of the dataset is 20, with 50% (10 items) being higher than the mean and median when X=>65. 10% of the 20 items of data are when X=60, 61, 69 and 70, so 90% of the data are when 62<=X<=68, i.e., between 62 and 68.