this is pretty easy to most people its just that ive never studied this (open attachment) im in year 7
2 answers:
Answer:
Step-by-step explanation:
If a child is chosen at random, we are picking from all the children, of which there are a total of 20 (it says that at the top). You could also just add up all the numbers in the boxes to see that there are 20 students. There are a total of 8 girls. So the answer to a. What is the probability that the chosen child is a girl is the ratio of girls to total children:
. But always reduce if you can, so the actual ratio of girls to total students is
. So
a.
Now we want to know, out of girls only, what is the chance we will pick a left-handed girl. Out of the 8 girls total, only 2 of them are left-handed (not too many of us around!). Stating that as a ratio (which is another way to say "fraction"), we have
. But again, reduce if you can, so
b.
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Answer:
0.43
Step-by-step explanation:
It's easy if you think of 43% as a decimal if you base it off 100. For example lets write a fraction about it: . A decimal you can think of the same way. 0.43 is the same as saying 43% of 100 or 43/100.