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AveGali [126]
3 years ago
13

Some of the children at a school arrive by car.

Mathematics
2 answers:
patriot [66]3 years ago
5 0

the probability that a child chosen at random from the school arrives by car is 0.74 .

<u>Step-by-step explanation:</u>

Here we have , Some of the children at a school arrive by car.

30% of the children at the school are boys

60% of the boys at the school arrive by car

80% of the girls at the school arrive by car

We need to find what is the probability that a child chosen at random from the school arrives by car .Let's find out:

Probability of child to arrive by car = Probability of a girl to arrive by car + Probability of a boy to arrive by car

⇒  Probability of a boy to arrive by car = \frac{3}{10} (\frac{6}{10} )

⇒  Probability of a boy to arrive by car = \frac{18}{100}

⇒  Probability of a boy to arrive by car = 0.18

Also , Probability of a girl to arrive by car  =  \frac{7}{10} (\frac{8}{10} )

⇒ Probability of a girl to arrive by car = 0.56

Putting these values we get:

⇒ Probability = 0.56+0.18

⇒ Probability =0.74

Therefore , the probability that a child chosen at random from the school arrives by car is 0.74 .

noname [10]3 years ago
3 0

Answer:

0.74

Step-by-step explanation:

30% boys

So 100-30 = 70% girls

(60% × 30%) + (80% × 70%)

0.74

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