Question

In a school there are 350 girls and 250 boys The probability of left hand girls is 0.2
The probability of left hand boys is 0.1
Estimate number of left hand students

Answer 1

Answer:

0.3

Step-by-step explanation:

Answer 2

Given,

In a school;

Number of boys = 250

Number of girls = 350

The probability of left-hand girls = 0.2

The probability of left-hand boys = 0.1

To find,

The number of left-hand students.

Solution,

We can simply solve this mathematical problem using the following process:

Mathematically,

The probability of occurrence of a favorable event = P (favorable event)

= (Total number of occurrence of the favorable event) / (Total number of occurrence of all possible events)

= (Total number of occurrence of the favorable event) / (Total number of trials)

Now, according to the question;

The probability of left-hand girls = 0.2

=> (total number of left-hand girls)/(total number of girls in the school) = 0.2 = 1/5

=> total number of left-hand girls = (total number of girls in the school) x 1/5

=> total number of left-hand girls = 350 x 1/5

=> total number of left-hand girls = 70

{Equation-1}

And,

The probability of left-hand boys = 0.1

=> (total number of left-hand boys)/(total number of boys in the school) = 0.1 = 1/10

=> total number of left-hand boys = (total number of boys in the school) x 1/10

=> total number of left-hand boys = 350 x 1/10

=> total number of left-hand boys = 35

{Equation-2}

Now, adding equations 1 and 2, we get;

(total number of left-hand girls) + (total number of left-hand girls) = 70 + 35

=> total number of left-hand students in the school = 105

Hence, the total number of left-hand students in the school is equal to 105.