Asked/Added Questions From NCERT:


Question 1. Asked on :09 February 2019:04:31:17 PM

What is the range of the probability of an event. 

-Added by Harshita Rathore Mathematics » Probability

Answer:

Himanshi Verma

 If an event is impossible its probability is zero. Similarly, if an event is certain to occur, its probability is one. The probability of any event lies in between these values. It is called the range of probability and is denoted as 0 ≤ P (E) ≤ 1.

-Answered by Himanshi Verma On 09 February 2019:04:32:27 PM


Question 2. Asked on :13 January 2019:01:13:28 PM

 Find the median of11,12,2x+2,3x,21,23 where x is the mean of 5,10,3.

-Added by Akki chauhan Mathematics » Probability

Answer:

Jyoti Srivastva

 We know, 

if the number of observation (n) is even 

then, 

1. first of all find the value at the position 

2. and find the value at the position 

3. now find the average of two value to get the median .

e.g., 


Given, 11, 12, 14, 18, (x + 2), (x + 4) , 30, 32 , 35 , 41 are in ascending order .

number of terms = 10 {even} 


so, median = {(n/2)th + (n/2 + 1) th }/2 

24 = (5th + 6th)/2 

24 = {(x + 2) + (x + 4)}/2 

24 = (x + 3) 

x = 21 


hence, x = 21


-Answered by Jyoti Srivastva On 30 January 2019:04:32:47 PM


Question 3. Asked on :13 January 2019:12:42:04 PM

 Fill in the blanks :

(i) The probability of an impossible event is .............

(ii) The  probability of happening of a possible event is always lies between ........... and...........

(iii) On tossing a coin, We get a total of ............. outcomes.

-Added by Akki chauhan Mathematics » Probability

Answer:

Akki chauhan

  Ans 1. Zero(0)

Ans 2. 0 and 1

Ans 3. 2

-Answered by Akki chauhan On 15 January 2019:09:06:44 AM


Question 4. Asked on :13 January 2019:11:53:09 AM

 A bag contain slips bearing from 1-89. A slip is drawn at random from the bag. Find the probability that the slip drawn has: 

(a) A number written on it such that sum of its digit is 11.

(b) A number greater than 63 written on it. 

-Added by Akki chauhan Mathematics » Probability

Answer:

Himanshi Verma

 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 Himanshi Verma On 20 January 2019:05:29:47 PM


 

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