A random sample of eight adults aged 30 years were asked how much they spent on medical costs in the year 2009.The following data were measured.

30014056005204707006401200

1. Compute the sample mean
2. Compute the sample standard deviation
3. Compute the sample median
4. Compute the first and third quartiles

Four hundred melanoma patients were diagnosed according to the type of skin cancer and the location of the skin cancer.This data is presented below.

Location

Type

Head and Neck

Trunk

Extremities

Total

Hutchinson's Melanomic Freckle

22

2

10

34

Indeterminate

11

17

28

56

Nodular

19

33

73

125

Superficial Spreading Melanoma

16

54

115

185

Total

68

106

226

400

1. What proportion of patients had Superficial Spreading Melanoma?
2. Of patients with a skin cancer on the Trunk, what proportion had a nodular skin cancer?
3. What proportion of patients had a Hutchinson's Melanomic Freckle on the extremities?
4. Is type of skin cancer independent of location?Justify your answer.