Answer:

Step-by-step explanation:
We want to find a common factor for

and

We factor each of them to get;

and

We can observe now that;
The factor common to both expression is

The standard error of the mean is the standard deviation which is 6.50
Answer:
Step-by-step explanation:
i think you will replace x and y respectively,as in take 1\3 as x and -7\2 as y and so on as the next question
2.25 times............................................
13 spades, 52 cards total
probability of drawing a single spade = 13/52 = 1/4
If we replace that card, then the probability of drawing of drawing a spade is still 1/4 as nothing has changed
Overall, the probability of getting two spades in a row is (1/4)*(1/4) = 1/16
note: the two events are independent because of the replacement happening
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The answer as a fraction is 1/16
As a decimal, that would be 0.0625 which converts to 6.25%