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The responses of a sample of 1000 adults who were Type of lenses asked what type of corrective lenses they wore are Contacts shown in the table at the right. Find the mean, median, Eyeglasses and mode of the data, if possible. If any measure cannot be found, explain why.

Type of Lenses Frequency, f
Contacts 30
Eyeglasses 170
Contacts and Eyeglasses 580
None 220
   

Find the mean. Select the correct choice below and, if necessary, fill in the answer box to complete your choice.

A. The mean is___ ?

B. The mean cannot be calculated because the data are at the nominal level of measurement.
C. The mean cannot be calculated because the sample size is too small. 

D. The mean cannot be calculated because there is an even number of data values.

Does the mean represent the center of the data?
A. The mean represents the center. 
B. The mean does not represent the center because it is not a data value.
C. The mean does not represent the center because it is the smallest data value. 
D. The mean does not represent the center because it is the largest data value. 
E. The data set does not have a mean.

Find the median. Select the correct choice below and, if necessary, fill in the answer box to complete your choice.