Below is a control chart for a product whose quality standards are unknown. Sub group Sample 1 Sample 2 Sample 3 X Bar R 4 1234S000 169TH co 300 000 4324D206 6 7 7 10 10 8 10 6 4 8 12 10 11 11 11 10 4 If the X and Rgraphs are drawn a) X upper control limit= (type in one decimal format such as a,b) b) X center line = c)X lower control limit= (type in one decimal format such as a,b) d) R upper control limit= (type in two decimal format such as a,bc) e) R center line= f) R lower control limit= 10 Average