Wind speed data has been collected from two different weather stations over the course of fifty days of stormy weather.

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Rockall

Raw data is collected from Rockall- the wind speeds, measured in km/h on the fifty days in the study are recorded, in ascending order, in the table below:

23 24 26 29 30

30 34 35 38 39

42 46 47 48 49

49 50 51 51 53

53 55 56 58 59

61 62 64 65 68

68 68 69 70 73

74 74 75 77 81

81 82 85 86 89

90 90 91 94 95

Find the mean, mode and median wind speeds, and comment on your findings.

Use Excel to find the standard deviation of the wind speeds, and explain its relevence. 

Find the upper and lower quartiles of the data, and use them to draw a box and whisker diagram of the wind speeds. Use a scale that goes up to 130 km/h so that you can fit the second data set on it also.

20 Marks

North Utsire

The wind speed data from North Utsire is given as grouped data:

Wind speed (wkm/h)

30 ≤