≡
Online Test      LOGIN      SIGN UP
Forgot your password?

  • Delhi Police Exam Numerical Ability Study Material

Digitization help student to explore and study their academic courses online, as this gives them flexibility and scheduling their learning at their convenience. Kidsfront has prepared unique course material of Numerical Ability Statistical for Delhi Police Exam student. This free online Numerical Ability study material for Delhi Police Exam will help students in learning and doing practice on Statistical topic of Delhi Police Exam Numerical Ability. The study material on Statistical, help Delhi Police Exam Numerical Ability students to learn every aspect of Statistical and prepare themselves for exams by doing online test exercise for Statistical, as their study progresses in class. Kidsfront provide unique pattern of learning Numerical Ability with free online comprehensive study material and loads of Delhi Police Exam Numerical Ability Statistical exercise prepared by the highly professionals team. Students can understand Statistical concept easily and consolidate their learning by doing practice test on Statistical regularly till they excel in Numerical Ability Statistical.


Statistical
The mean weight of 34 students of a school is 42 kg. If the weight of the teacher be included, the mean rises by 400 g. find the weight of the teacher in kg

a) 66
b) 56
c) 55
d) 57


✔Answer
✔Solution
Correct Answer Is : 56
Solution Is : Total weight of student = number of student x avearege =34x42=1428kg
now,when teacher is included
total member = 34+1=35
Average Weight =42+0.400=42.4kg
similarly their total weight = 42.4x35=1484kg
therefore weight of teacher =(total weight including teacher -
total weight excluding teacher)
= 1484-1428 = 56 kg
Study the chart and answer the following question

Themean of the highest and the lowest sale (in rs crore )is

a) 4922
b) 4922.5
c) 4827
d) 4365


✔Answer
✔Solution
Correct Answer Is : 4827
Solution Is : Mean = Highest sale +
Lowest sale / 2
= 8730 + 924 / 2
= 4827 core
The average marks secured by 36 students was 52. but it was discovered that an item 64 was misred as 64.what is the correct mean of mark?

a) 54
b) 53.5
c) 53
d) 52.5


✔Answer
✔Solution
Correct Answer Is : 52.5
Solution Is : Correct mean=52*36-46+64/36
52*36+18/36
104+1/2=105/2=52.5
The mean high temperature of the first four days of a week is 25°C whereas the mean of the last four days is 25.5°C. If the mean of the whole week is 25.2°C, then the temperature of the 4th day is

a) 25.2°C
b) 25.5°C
c) 25.6°C
d) 25°C


✔Answer
✔Solution
Correct Answer Is : 25.6°C
Solution Is : Average higher temperature of four days = 25oC
Total higher temperature of four days = 4 x 25 = 100oC
Average temperature of four days = 25.5oC
Total temperature of these four days = 4 x 25.5 = 102oC
Average temperature of a week = 7 x 25.2 = 176.4oC
Hence, temperature of fourth day = (100 + 102) - 176.4 = 25.6oC
Find the mean of the first 6 prime numbers?

a) 15 / 3
b) 6
c) 41 / 6
d) 12 /4


✔Answer
✔Solution
Correct Answer Is : 41 / 6
Solution Is : The first 6 prime numbers are 2 , 3 , 5 , 7 ,11 , 13 Mean = ( 2 + 3 + 5 + 7 + 11 + 13 ) / 6 = 41 / 6
The mean proportion of 1.21 and 0.09 is

a) 0.33
b) 3.03
c) 3.3
d) 0.033


✔Answer
✔Solution
Correct Answer Is : 0.33
Solution Is : Mean proportion = √ab here, a=121 and b= 0.09 So, Mean proportion = √121*0.09 = √121/100 * 9/100 √11*11/10*10 * 3*3/10*10 = 11*3/100 = 33/100 = 0.33.
The arithmetic mean (average) of the first 10 whole numbers is

a) 5
b) 4
c) 5.5
d) 4.5


✔Answer
✔Solution
Correct Answer Is : 4.5
Solution Is : (4) Required average =(0+1+2+3+....+9)/10 =(9*(9+1))/(2*10) 4.5
The mean of 9 observations is 16. One more observation is included and the new mean becomes 17. The 10th observation is

a) 9
b) 16
c) 26
d) 30


✔Answer
✔Solution
Correct Answer Is : 26
Solution Is : (3) Tricky Approach Tenth observation =10*17-16*9 =170-144 =26
The average of x numbers is y and average of y numbers is x. Then , the average of all the numbers taken together is

a) (x+y )/ 2xy
b) 2xy / (x+y)
c) (x2 + y2) /(x+y)
d) Xy/(x+y)


✔Answer
✔Solution
Correct Answer Is : 2xy / (x+y)
Solution Is : Average of x nuber is y . Sum of x numbers = x * y = xy Similarly , average of y numbers is x , Sum of y numbers = y * x = xy Sum of total numbers = xy + xy = 2xy Average of totasl numbers = 2xy / (x+y)
The mean value of 20 observation was found to 75, but later on it was detected that 97 was misread as 79. Find the correct mean.

a) 75.7
b) 75.8
c) 75.9
d) 75.6


✔Answer
✔Solution
Correct Answer Is : 75.9
Solution Is :
PREVIOUS

Other Topics

Preparation for Exams

Practice Last year paper

Kids Learning

Academics

Competitive Exams

Govt. Jobs Exams

Copyright © 2024 Kidsfront.com | Terms Of Use

script type="text/javascript">