The monthly salaries in cedis to the nearest cedis 10 of a group of men are 540 580 620 700 830 910 620 700 830 860 1000 and 1200.a) find the range at one data.b) using the assumed mean cedis 830 or otherwise. calculate,correct to the nearest cedis,the means and standard deviation of the salaries.c) calculate also the means and the standard deviation when each of the salaries is increased by 20%. it is a statistics question​