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## Mean and Standard Deviation

If the mean and standard deviation of the data set {12,14,19,x} are 15 and √26, respectively, x = ? Loading ...

## Call It In The Air

What is the probability that a fair coin will show “heads” 2 out of 4 times? Loading ...

## Best of a Series

Two teams are playing a best-of-five series, which ends as soon as either team wins three games. If the two teams are equally likely to win a game, regardless of the outcomes of the others, what is the probability that the series ends after the first three games? Loading ...

## Median of Four Values

If the mean of 15, x, 17 and 12 is 15, what is the median of these four values? Loading ...

## Trigonometric Identities

Which of the following expressions can be simplified such that the result is equal to 1? Loading ...

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Photo attributed to melburnian.

What is the value of 10-2 + 10-3 + 10-4? Loading ...

## Miles of Calculations

One-hundredth of a mile equals approximately how many meters? Loading ...

## Scientific Notation

2.4 x 10-6 x (5 x 106)2 = ? Loading ...

## Units of Liquid

Joe has a water bottle with 106 units of liquid. He notice that his bathtub holds 102 water bottles. How many units of liquid does his bathtub hold? Loading ...

## Area of the Shaded Triangle

Find the area of the shaded triangle, formed by the two squares below.  Loading ...