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Infant mortality rate is the number of babies who die before the age of one per thousand live births per year. Infant mortality rate shows how countries survival rates vary due different stages of develop...

From the equation for speed: Speed = frequency * wavelength 
=> v = 1000 * 0.34 = 340 metres per second 

There are many reasons for using statistical models. Some examples include:
1) To simplify a real world problem
To improve understanding and describe a real world problem, for example understan...

From the equation of the area of a triangle,
Area = 1/2 ACCBsin(C)
20 = 1/2 * 8 *12 * sin(x) 
=> sin(x) = 0.416666...
=> x = 0.430 to 3sf

The probability of an event not happening is 1 minus the probability of the event happening. Five of the twelve balls are red so the probability of selecting a red ball is 5/12. The probability of not sel...