C) a researcher has extracted two samples from the same target population, sample a and sample b. sample a has a mean of 25 kg while sample b has a mean twice that of sample a. sample size of sample a is three times more than that of sample b. sum of sample sizes is 60. calculate:
i. mean of sample b (1mark)
ii. sample size of sample a and sample b (2 marks)
iii. summation of x variables for sample a and sample b (4 marks)
iv. standard deviation of sample a and sample b, consider ungrouped data (5 marks)