Two samples of size 60 and 90 have 52 and 48 as the respective arithmetic and 9 and 12 as - Maths - Statistics

Question

Two samples of size 60 and 90 have 52 and 48 as the respective
arithmetic and 9 and 12 as the respective standard deviations Find
the standard deviations of the combined sample of size 150

Sirine Lahmar · Answer

Please find this answer
<img src=
"https://s3mn%20mnimgs%20com/img/shared/content_ck_images/ck_5dd99f0f3904a%20jpeg">

Two samples of size 60 and 90 have 52 and 48 as the respective arithmetic and 9 and 12 as the respective standard deviations. Find the standard deviations of the combined sample of size 150.