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Probability of an Event "A" Not to Happen

If the probab...

Question

If the probability of a day being rainy is 0.75, then the probability of it not being a rainy day is ___.

A

0.75

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B

0.50

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C

0.25

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D

0

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Q. The probability of a day being rainy is 0.75, then the probability of it not being a rainy day is .

Q. Martha wants to predict the probability of rain today based on the previous data. In the last 100 days, if it did not rain on 68 days, then what is the probability of today being a rainy day?

Last week, it rained on 5 days out of 7 days. The probability that if we pick a random day from the week, it will be a rainy day is

30

% chance that it rains on any particular day. What is the probability that there is at least one rainy day within a period of

7

days? Given that there is at least one rainy day, The probability that these are at least two rainy days is

(1 - {(0.7)}^{7}); \frac{1 - k {(0.7)}^{7}}{1 - {(0.7)}^{7}}

. Find the value of

k

.

30

chance that it rains on any particular day. Given that there is at least one rainy day in a week, what is the probability that there are at least two rainy days in the week?

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