AskQ logo

STUCK ON HOMEWORK?

ASK FOR HELP FROM OUR KIASUPARENTS.COM COMMUNITY!

Question

Answer

(a) 180 * 5/6 = 150

180 – 150 = 30

meaning 30 students scrored less than this point. 

From the graph, at the point of 30 students, the point is 36 marks

(b) 37 marks is after added by 15 and divided by 2,

So the original marks before teacher doing the manipulation = (37 – 15)2 = 44

From the graph, the number of student who who had 44 marks or less is 90.

(d) There are 170 students who scored less  than 60 marks or 10 students scored more than 60 marks.

Probability of a student score more than 60 and the other scored less than 60

= 2 * (170/180)* (10 /179) = 170/1611 = 0.1055

 

 

 

0 Replies 1 Like
0 Replies 1 Like