... there must be a peak, so we assume that the peak of the curve is 48 students. To find out what the ? value is, you need to do the following sum. The Pi value is not 3.1415 as used for calculating circumferences and areas of a circle in this case but is used for expressing radians. Pi/2 radian refers to 90o on a sine curve. A sine curve looks like this with Pi/2 radians at the bottom of the left-hand curve and Pi radians at the end on the right-hand side. 2Pi Radians are 360o. In our sine curve, the graph does not go past Pi because with the type of data that we are using, it would not be possible to have a negative number of students having coughs and sneezes. The diagram above is a full sine curve but for our data, we will only be using part of ...

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