Respuesta :
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.
[tex]\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[/tex]
Similarly,
[tex]\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[/tex]
Hence, there are 25+64=89 left handed students in school.
Probability is defined as the division of the sum of all the observations by a total number of observations.
The total number of left-handed students in school is 89.
The answer is 89.
Given
A school has 320 girls and 250 boys.
The probability that a girl is a left hand is 0.2.
The probability that a boy is left-handed is 0.1.
What is probability?
Probability is defined as the division of the sum of all the observations by a total number of observations.
The following formula is used to calculate the probability is given by;
[tex]\rm Probability = \dfrac{Sum \ of \ all \ observation}{Total \ number \ of \ observation}[/tex]
The number of girls is 320 and the probability that a girl is a left hand is 0.2.
[tex]\rm Probability \ of \ girls= \dfrac{Number \ of \ left \ handed \ girls}{Total \ number \ of \ girls}\\\\\rm 0.2= \dfrac{Number \ of \ left \ handed \ girls}{320}\\\\Number \ of \ left \ handed \ girls=0.2 \times 320\\\\Number \ of \ left \ handed \ girls=64[/tex]
The number of boys is 250 and the probability that a girl is a left hand is 0.1.
[tex]\rm Probability \ of \ boys= \dfrac{Number \ of \ left \ handed \ boys}{Total \ number \ of \ boys}\\\\\rm 0.1= \dfrac{Number \ of \ left \ handed \ boys}{250}\\\\Number \ of \ left \ handed \ boys=0.1 \times 250\\\\Number \ of \ left \ handed \ girls=25[/tex]
Therefore,
The total number of left-handed students in school is = Number of left-handed girls + Number of left-handed boys.
The total number of left-handed students in school is = 64 + 25
The total number of left-handed students in school is = 89
Hence, the total number of left-handed students in school is 89.
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https://brainly.com/question/1118914
