Most frequent value = Mode = 39. Mode Formula For Grouped Data. Since you cannot figure out the value with the maximum appearance in the given grouped data, ...

In National 4 Maths learn to calculate the mean, mode, median and range from a frequency table. Draw a pie chart and find the chance of it happening.

If data is organised into groups, we do not know the exact value of each item of data, just which group it belongs to. This means that we cannot find the exact value for the mode, median or mean.