CJunc95801
26.03.2020 •
Mathematics
Find the probability of each event. Answer IN FRACTION form.
A class has four girls and two boys. If the teacher randomly picks four students, what is the probability that she will pick all girls?
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Ответ:
Total amount of students = 6
Total amount of girls = 4
So, chance of picking a girl first time is 4/6 or 2/3 chance
But remember! The girl is picked, and we do not want to replace her back into the set. So total amount of students drop to 5 and girls drop to 3
So using that logic, The probability of choosing all girls = 4/6 * 3/5 * 2/4 * 1/3 = 1/15.
Ответ:
Add the contributions:
5,358 + 2,834 + 4,132 = 12,324 < this is the current total amount raised. subtract this from the goal, 14,000 to find out much more money is needed for the playground.
14,000 - 12,324 = 1,676
$1,676 is still needed in order to create the playground.