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A class of 30 students consist of 8 Chinese girls,3 Mala girls,1 Indian girl,11 Chinese boys ,4 mala boys and 3 Indian boys .if a student is chosen at random to take part in a survey find the probability that the student is

1.agirl
2.not a Chinese
3.not an Indian boy
4.a euroasian

Respuesta :

reinhard10158

Step-by-step explanation:

a probability is always the ratio

desired cases / totally possible cases

now, in all 4 problems the totally possible cases are 30.

1. a female student

how many female students are there ?

8 + 3 + 1 = 12

so, the probabilty to choose a female student is

12/30 = 2/5 = 0.4

2. not a Chinese

how many Chinese students are there ?

8 + 11 = 19

so, not Chinese students are

30 - 19 = 11

and the probabilty that the student is not Chinese is

11/30 = 0.366666666...

3. not an Indian male student

how many Indian male students are there ?

3

so, not Indian male students are

30 - 3 = 27

the probability to choose a non-Indian male student is

27/30 = 9/10 = 0.9

4. a eurasian

what is an eurasian ? it is a person from any country/ culture in Europe or in Asia. all the mentioned countries are in Europe or Asia.

so, how many eurasians are there ?

8+3+1+11+4+3 = 30

all of them.

so the probabilty to choose an eurasian is

30/30 = 1 the totally sure outcome.

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