wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

Standard deviation about mean (¯x) for a given discrete frequency distribution x1,x2,x3,.....xn with frequencies f1,f2,f3,...fn is


A


No worries! We‘ve got your back. Try BYJU‘S free classes today!
B


Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
C


No worries! We‘ve got your back. Try BYJU‘S free classes today!
D

No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is B



We know variance for a discrete frequency distribution can be calculated as follows,

σ2 = ni=1fi(xi¯x)2ni=1fi


This can be understood from normal variance calculation as each value xi occurs fi time total number of observations is ni=1fi and each deviation should be added fi times i.e.

ni=1fi(xi¯x)2

Standard deviation = σ=ni=1fi(xi¯x)2ni=1fi


flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Practice Set 1
MATHEMATICS
Watch in App
Join BYJU'S Learning Program
CrossIcon