Ur answer is c
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To do this, you can just multiply across. 3 times 1 equals 3 so your numerator is 3. 2 times 4 equals 8. Then, your answer would be 3/8. Hope this helps :)
Why not look up "standard deviation" yourself, to be sure? But yes, the std. dev. is the sqrt of the variance.
She got $30, because 10 is 1/3 of 30. Think of it like this. What's 10·3? If it was 1/6, she would have 60 dollars, because 10<span>·6 is 60.</span> The equation here, if your teacher is asking for that, would be (x/3=10), or (10·1/3=x). X represents the variable.
