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The grades on a math exam for a sample of 40 students are provided below: 63744265515436566857 62647667796181775938 84687194718669759155 48828354796268584147 a)Construct a stem-and-leaf display for the

The grades on a math exam for a sample of 40 students are provided below:

63744265515436566857

62647667796181775938

84687194718669759155

48828354796268584147

a)Construct a stem-and-leaf display for the data.[4 marks]

b)How many observations are in the middle class?[2 marks]

c)How many students obtained a grade of 80 or more?[2 marks]

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