Hi Tahan,
We have made a formula sheet for Statistics Class 11, which you can download.
Please check it here https://www.teachoo.com/5683/1804/Chapter-15-Class-11th-Statistics-Formula-Sheet/category/Chapter-15-Class-11th-Statistics/
Incase you need further clarifications, please comment.
Written on March 11, 2017, 7:36 p.m.