After a pollution accident, 180 dead ?sh were recovered from a stream. Table 1.5.4 gives their lengths measured to the nearest millimeter.
|
Length of Fish (mm)
|
1-19
|
20-39
|
40-59
|
60-79
|
80-99
|
|
Frequency
|
38
|
31
|
59
|
45
|
7
|
(a) Using the grouped data formula, ?nd the mean, variance, and standard deviation.
(b) Find the median for this grouped data and interpret.