Question

a school has 320 girls and 250 boys the probability that a girl is left hand is 0.2 the probability that a boy is left handed is 0.1 estimated number of left-handed students in school

Answer 1

Answer: There are 89 left handed students in school.

Step-by-step explanation:

Since we have given that

Total number of girls = 320

Total number of boys = 250

Probability that a girl is left hand = 0.2

Probability that a boy is left handed = 0.1

We need to find the number of left handed students in school.

$\dfrac{\text{Number of left handed students in school}}{\text{Total number of boys }}=0.1\\\\\dfrac{\text{Number of left handed students in school}}{250}=0.1\\\\\text{Number of left handed students in school}=0.1\times 250\\\\\text{Number of left handed students in school}=25$

Similarly,

$\dfrac{\text{Number of left handed students in school}}{\text{Total number of girls }}=0.2\\\\\dfrac{\text{Number of left handed students in school}}{320}=0.2\\\\\text{Number of left handed students in school}=0.2\times 320\\\\\text{Number of left handed students in school}=64$

Hence, there are 25+64=89 left handed students in school.

Answer 2

89 estimate number of left handed student in school