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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 = ?

Call It In The Air

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

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?

Median of Four Values

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

Trigonometric Identities

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

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Photo attributed to melburnian.

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

Miles of Calculations

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

Scientific Notation

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

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?