Mean and s.d

[manishofficial4378]

What would be the answer?

[chinmaymaganur]

is answer c
??

[mamidwar.piyush]

M + 0.5SD = 9.6
M - 0.25SD = 4.8
=> 2M - 0.5SD = 9.6

M = 6.4
SD = 6.4

is it C?

[manishofficial4378]

Yes the answer is C. Thanks.