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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

Himanshi Verma

Total no. of times tossing a coin= 1000

no. of tail comes= 1000-425= 575

probability   p(e)= 575/1000

-Answered by Himanshi Verma On 20 January 2019:04:27:24 PM

Question 2. Asked on :13 January 2019:11:49:45 AM

#### In a class test, the mean marks of boys and girls are respectively 42 and 45. If the mean marks of boys and girls are 44, Find the ratio of the number of boys to the number of girls.

-Added by Akki chauhan Mathematics » Statistics

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 22 January 2019:05:24:43 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

Akki chauhan

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

-Answered by Akki chauhan On 15 January 2019:09:03:48 AM

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

#### Define frequency of the observation.

-Added by Prince Rawat Mathematics » STATISTICS

Rohit Rajput

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

-Answered by Rohit Rajput On 12 January 2019:08:59:05 AM

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