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Asked/Added Questions From NCERT:


Question 1. Asked on :19 January 2019:10:22:48 AM

 On tossing a coin 1000 times head comes 425 times find the probability of getting a tails in this event.

-Added by Prince Rawat Mathematics » STATISTICS

Answer:

Master Purushottam

 Total no. of times tossing a coin= 1000

no. of head comes= 425

no. of tail comes= 1000-425= 575

probability   p(e)= 575/1000 

-Answered by Master Purushottam On 24 August 2019:12:18:13 AM


Answer:

Master Purushottam

 Let 'x' be the number of boys and 'y' be the number of girls.


To find the total marks


The total marks of boys = 42x


The total marks of girls = 45y


Total number of boys and girls = x + y


To find the ratio


The total marks of boys and girls = 44(x + y)


Then we can write


44(x + y) = 42x + 45y


44x + 44y = 42x + 45y


2x = y


x/y = 1/2


Therefore the ratio of the number of boys to the number of girls is 1:2


-Answered by Master Purushottam On 23 August 2019:11:37:42 PM


Question 3. Asked on :11 January 2019:02:55:18 PM

 Find the median of first 10 prime numbers.


-Added by Prince Rawat Mathematics » STATISTICS

Answer:

Shivang Gupta

The first 10 prime numbers are : 2,3,5,7,11,13,17,19,23 and 29.

n=10

Median if n is even numbers

n2 th term = 5th term = 11

n2 + 1 = 5 + 1 = 6th term = 13

Median = 5th term + 6th term2 

Median = 11 + 132 

 = 242 = 12 Answer

-Answered by Shivang Gupta On 25 August 2019:03:29:06 PM


Question 4. Asked on :11 January 2019:10:18:43 AM

 Define frequency of the observation.

-Added by Prince Rawat Mathematics » STATISTICS

Answer:

Shivang Gupta
 The number of times of an observation occurs in the given data is called the frequency of the observation.

-Answered by Shivang Gupta On 25 August 2019:03:29:24 PM


 

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