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Svet_ta [14]
3 years ago
6

IS THIS RIGHT? HELP ME CORRECT PLEASE

Mathematics
1 answer:
skelet666 [1.2K]3 years ago
3 0

Answer:

a) the no of coupons used at a super market cannot be normal as the no of coupons will not be symmetrical about the mean.  In other words, the no of coupons will be increasing and hence curve cannot be bell shaped as in normal.  So not normal

2) The weights of pumpkins that are delivered to a supermarket will be normal provided the number of pumpkins is large.  This is because of central limit theorem that the average weight of pumpkin will follow a normal distribution when sample size becomes large.

3) This is a discrete distribution because no of raisins is countable and hence cannot follow a normal distribution.  Normal distribution is meant for only continuous variables.

4) The amount of time customers spend waiting will follow an exponential distribution and cannot be normal

Step-by-step explanation:


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A bad contains 8 black,3red and 9 white balls. If 3 balls are drawn at random, find the probability that none is red
LenKa [72]

Argument

You have a total of 8 + 9 + 3 balls = 20

The first ball is 17/20         Probability that no ball drawn is red the first time

The Second ball is 16/19   Probability that no ball drawn is red the 2nd time

The third ball is 15/18        Probability that no ball drawn is red the 3rd time

Answer

Total Probability = 17/20 * 16/19 * 15/18 = 34/57

My calculator figures out fractions. You can do this just as easily with decimals.

0.85 * 0.8421 * 0.8333333 = 0.5964

34/57 = 0.5965  which is close enough.

If you have choices, choose the one that coincides with my answer. Otherwise use the decimal value.

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