17/50
3/25
1/50
3/250
Correct answer is A
Blue balls = 5
Red balls = 3
White balls = 2
Total = 10
P(Two blue) = 5/10 * 5/10 = 25/100
P(Two Red) = 3/10 * 3/10 = 9/100
∴P(Two blue or two red balls)
= 25/100 + 9/100
= 34/100
= 17/50
How many possible ways are there of seating seven people P,Q,R,S,T,U and V at a circular table
360
720
2520
5040
Correct answer is B
(n - 1)! = (7 - 1)!
= 6!
= 6*5*4*3*2*1
= 720 ways
In how many ways can 6 coloured chalks be arranged if 2 are the same colour?
60
120
240
360
Correct answer is D
\(\frac{6!}{2!}=ways=\frac{6\times5\times4\times3\times2!}{2!}\\=6\times5\times4\times3\\=360\hspace{1mm}ways\)
Find the value of t if the standard deviation of 2t, 3t, 4t, 5t, and 6t is √2
1
2
3
4
Correct answer is A
No explanation has been provided for this answer.
1.35
1.65
1.95
3.00
Correct answer is C
1.35, 1.25, 1.35, 1.40, 1.35, 1.50, 1.35, 1.50, and 1.20
Modal height = 1.35
Range (r) = 1.50 - 1.20
= 0.30
∴m + 2r = 1.35 + 2(0.30)
= 1.35 + 0.60
= 1.95