1.What is the lower boundary of class interval 21 — 23?
2.What is the less than cumulative frequency (cf) in the clas 18—20?
3.Which class interval does Quartile 1 (Q1) belong?
4.What is the value of Quartile 1 (Q1)?
5.Which class interval does Decile 4 (D4) lie?
6.What is the value of Decile 4 (D4)?
7.Which class interval does Percentile 4 (P4) lie?
8.What is less than cumulative frequency of P4?
9.What is the value of P4?​