5√2*5√2 - 1

= 25*2 - 1

= 49  (answer)

EDIT: oops, the solution by CPhil wasn't showing when I added mine. NVM

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The above answer is a little wrong.  -43/7 = 6.143 

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I'm sure the poster intended factorial 10 there.

9 + 10! = 9 + 10x9x8x7x6x5x4x3x2x1 = ......  (answer)

That final computation is left as an exercise for the student. 

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Consider common fractions such as  ½  or  ¾ , etc. We see that the top is the smaller number in common fractions.

Now,count the letters in these words: "numerator" and "denominator". Which word has the fewest letters? "Numerator" is the shorter word, in common fractions it's also the smaller number.

Finally, generalise this to all fractions, both proper and improper: the top number is always the numerator.

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A common description is "bell-shaped". Another is "rectangular".

Another could be double-humped.

These describe the shape of a graph showing the likelihood of occurrence of permissible data values.

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We can only guess, since you provide no context.

But it means some dimension measures 5cm. Perhaps it's the side of a polygon, or some other distance measure.

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Q: Is .447 closer to .4 or to .5?

Let's see. .447 - .4 = .047

On the other hand, .5 - .447 = .053

Which of those differences is the least? That tells you which to round to.

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INCEPTION 10 9 9 10 9 10 9 8 10 8

mean μ = 92÷10 = 9.2

σ² = ( 4*(10-9.2)² + 4*(9-9.2)² + 2*(8-9.2)² )÷10

= 0.56

⇔  standard deviation for this data set, σ = 0.748

SAVES THE WORLD 10 1 3 10 2 7 10 4 10 10

mean μ = 67÷10 = 6.7

σ² = ( 4*(10-6.7)² + (7-6.7)² + (4-6.7)² + (3-6.7)² + (2-6.7)² + (1-6.7)² )÷10

= ......

⇔ standard deviation for this data set, σ = ....

I leave the remaining calculator work as an exercise for the student. 

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One way is to take the square root after you've squared it.

Some calculators have the abs() function for returning the absolute value.

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Hi Mellie.

expected value,  E(x) = 0.6*4 + 0.2*-1 + 0.2*-10 

= 2.18

≈ $2

Probabilty carries no certainty. Knowing my luck, if I was given 10 throws, I'd come out $100 poorer!