The frequency distribution below summarizes the batting averages of a sample of Major League Baseball players:
Batting Average Frequency
0.160-0.180 2
0.180-0.200 4
0.200-0.220 9
0.220-0.240 12
0.240-0.260 13
0.260-0.280 32
0.280-0.300 41
0.300-0.320 22
0.320-0.340 8
a) What is the relative frequency (i.e., proportion) of observations falling in the 0.260-0.280 interval? (Give your answer to four decimal places.)
b) What is the shape of the data distribution?
c) Which is greater -- the median or the mean?
d) Which interval contains the first quartile of data values?