Describe MEAN for math

1 answer:

8 0

Mean is basically the average of all the numbers. To find a mean one would have to add up all the numbers together then divide by the numbers available. For an example to find the mean for the following numbers (5,4,6,7) One would have to add up all the numbers then divide them by 4. So 22/4= 5.5 would be the mean.

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A bag contains 8 red marbles, 3 blue marbles and 7 green marbles. If three marbles are drawn out of the bag, what is the probabi

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Answer:

Step-by-step explanation:

A bag contains 8 red marbles, 3 blue marbles and 7 green marbles.

Total = 18 marbles.

Probability of drawing three red marbles = probability of drawing one red without replacement + probab of drawing another without reeplacement + probab of drawing a third without replacement.

Probability of drawing three red marbles = 8/18 + 7/17 + 6/16 = 0.4444 + 0.4118 + 0.3750 = 1.2312.

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Number defective=4
number of non-defective=total-defective
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so 20C2

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