Question

I need correct answer plzz​

Answer 1

Answer:

Each section below

Step-by-step explanation:

(a) Add all frequencies together = 200, then add 1 and divide by 2 = 100.5, lastly you need to add each frequency until you find the interval that contains the 100th and 101st height.

23+47 = 70

70+45 = 115 -> so the answer is 10<h<13

(b) Step 1: find the midpoint of each interval (upper limit+lower limit then divide by 2)

(2+6)/2 = 4

(6+10)/2 = 8

(10+13)/2 = 11.5

(13+17)/2 = 15

(17+19)/2 = 18

(19+20)/2 = 19.5

Step 2: multiply the midpoint of each interval with it's frequency

4*23 = 92

8*47 = 376

11.5*45 = 517.5

15*38 = 570

18*32 = 576

19.5*15 = 292.5

Step 3: add all of the above and divide it by the total frequency

92+376+517.5+570+576+292.5 = 2424

2424/200 = 12.12 (this is your answer to part b)

Hope this helped :)