## Numerical Ability

#### Numerical Ability

1. The statistics of runs scored in a series by four batsmen are provided in the following table. Who is the most consistent batsman of these four?

 Batsman Average Standard Deviation K 31.2 5.21 L 46.0 6.35 M 54.4 6.22 N 17.9 5.90

1. K
2. M
3. L
4. N

1. Most consistent player is the one with least dispersion in the scores. For this, Coefficient of Variance is used to measure relative measure of dispersion between two sets.

 Coefficient of Variance(CV) = Standard Deviation Mean

Calculating it for all the four players.
K's CV = 0.167
L's CV = 0.138
M's CV = 0.114
N's CV = 0.329
Larger the value of CV, less consistent is the player. So the most consistent player is M.

##### Correct Option: B

Most consistent player is the one with least dispersion in the scores. For this, Coefficient of Variance is used to measure relative measure of dispersion between two sets.

 Coefficient of Variance(CV) = Standard Deviation Mean

Calculating it for all the four players.
K's CV = 0.167
L's CV = 0.138
M's CV = 0.114
N's CV = 0.329
Larger the value of CV, less consistent is the player. So the most consistent player is M.

1. The current erection cost of a structure is Rs.13,200. If the labour wages per day increase by 1/5 of the current wages and the working hours decrease by 1/24 of the current period, then the new cost of erection in Rs. is
1. 16,500
2. 15,180
3. 11,000
4. 10,120

1. Cost ∝ (wages × hours)
c ∝ wh

##### Correct Option: B

Cost ∝ (wages × hours)
c ∝ wh

1.  Find the sum of the expression 1 + 1 + 1 + ..........+ 1 √1 + √2 √2 + √3 √3 + √4 √80 + √1

1. 7
2. 8
3. 9
4. 10

1. Multiply each term and divide each term by its conjugate.

##### Correct Option: B

Multiply each term and divide each term by its conjugate.

1. A tourist covers half of this journey by train at 60 km/h, half of the remainder by bus at 30 km/h and the rest by cycle at 10 km/h. The average speed of the tourist in km/h during his entire journey
1. 36
2. 30
3. 24
4. 18

1.  Vavg = Total distance Total time

##### Correct Option: C

 Vavg = Total distance Total time

1. Out of all the 2-digit integers between 1 and 100, a 2-digit number has to be selected at random. What is the probability that the selected number is not divisible by 7?
1.  13 90

2.  12 90

3.  78 90

4.  77 90

1. P(A) = 1 – P (A)

 P(A) = 1 - 13 = 77 90 90

##### Correct Option: D

P(A) = 1 – P (A)

 P(A) = 1 - 13 = 77 90 90