The test scores of 40 students are listed below: 30 35 43 44 47 48 54 55 56 57 59 62 63 65 66 68 69 69 71 72 72 73 74 76 77 77 78 79 80 81 81 82 83 85 89 92 93 94 97 98.

Requirements:

1. Find the 85th percentile (P85)

2. What is the value of the 4th decile (D4)?

3. What is the value of the interquartile range?

4. What is the shape of the distribution of the data based on the coefficient of skewness?

5. How would you classify distribution based on the index of kurtosis?

6. What is the value of the coefficient of variation of the data?