Question

7. The mean of the five number is 30 If one number is deleted then their mean is
28 then the deleted number is
(a) 28
[ ]
(b) 38
(c) 30
(d) None of these




8. If each observation of the data is increased by 3 then their mean is
(a) decreased by 3
(b) no changes
(c) increased by 3
(d) None of these
[
]
9. Mode of the data 15,14,19,20,16,15,16,14,15,18,14,19,16 is
(a) 16
(b) 14
(c) 12
(d)19
10.In equation y=mx+c ,m is a
(a) intercept (b) slope
(c) origin
[ ]
(d) None of these
[ ]
11.The graph Of x=3 is a line
(a) parallel to y-axis
(c) origin
(b) parallel to x-axis
(d) None of these
12.Any point on the line x=y is of the form
[ ]
(a)(K,0)
(b) (kk)
(c)(0,0)
(d) (0,k)
13. Point (3,4) lies on the graph of the equation 3y=kx+7 The value of k is
(a) 2/3
(b) 5/3
(C) 0
(d) 3/7 [ ]
[ ]
14.Range of the data 7,8,5,6,11 is
b) 2
a) 3
(c) 6
d) 4
[ ]
15. If x=2, y= 1 is a solution of the equation 2x+3y=k Then k=
(a) 7
(b) 5
(C) 0
(d) 8​

Answer 1

Answer:

7.

total sum = mean * number of term

total sum =30*5=150

now, suppose the number deleted is = x

then, according to the question.............

(150-x)/4=28...........(now  there is only 4 term because one term is deleted)

150-x=28*4

150-x=112

150-112=x

x=28 ans.

so ,,option (a) is correct answer.

Step-by-step explanation: