Students in a college were classified according to years in school (X) and number of visits to a museum in the last year (Y = 0 for no visits, 1 for one visit, 2 for more than one visit). The joint probabilities in the accompanying table were estimated for these random variables.

a. Find the probability that a randomly chosen student has not visited a museum in the last year.
b. Find the means of the random variables X and Y.
c. Find and interpret the covariance between the random variables X and Y.

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Years in School (X) Number of Visits (Y) 0.07 0.13 0.04 2 0.05 0.11 0.04 0.03 0.17 0.09 0.02 0.15 0.10