Question

Ch 18-11
10 - 20
8
TICSMETIC MEAN, MEDIAN, MODE AND QUARTILES
alculate the Arithmetic mean, correct to one decimal place, for the following frequency distribution of marks
btained in an Arithmetic test.
0 - 10
20 – 30
30 - 40 40 - 50
2
5
20
8
en by allowing table gives the marks scored by students in an examination :
0-5 | 5 - 10 10 - 15 15 - 20
20 - 25
25 - 30 30-35
3
7
2.
15
24
16
Marks
ICSE
7
ICSE) No. of students
35 - 40
Marks
-18
5
8
No. of students
IC
Calculate the mean mark, correct to two decimal places.
CSE)
ANSWERS
129, 0.11
2. (a) a=6 (6) 3.6 (c) 3 (d) 1 (e) 5-6 6 9 (g) 9 (h) 24 (x+
4. 88
5. 35-6 marks
13-x,
8. 23-4 marks​

Answer 1

Answer:

Given ,

Two charge q1=+1μC

qp=1μC

q2=4μC

d=30cm=.3m

Let point P (where, f1μC=0) is at distance r from q1   [ref. image]

F1+F2=0

kr2q1×qp−k(.3−r)2q1qp=0

r2q1=(∗.−2)2q2

(r.3−r)2=q1q2=14=4