The company "TRAMAD" is conducting a study on the variation of the prices of its shares, listed on the Santiago Stock Ex

[answerhappygod]

The company "TRAMAD" is conducting a study on the variation of
the prices of its shares, listed on the Santiago Stock Exchange.
For this purpose, it takes a sample of prices corresponding to the
last 30 working days. The value indicated is the one that has been
registered at the closing time of the operations:
450     540     280     440     350     720     400     190     410     700
600     500     250     780     290     580     320     220     320     660
300     360     320     605     180     300     210     520     290     420
a) Make a frequency table.
b) Calculate the mean and standard deviation.
d) Calculate and interpret the quartile 1.