25 plz

Dear Student,

Standard Deviation, S.D.=xi2n-xin23.5=4+9+a2+1214-2+3+a+11423.52=134+a24-16+a42494=134+a24-256+a2+32a1649=536+4a2-256-a2-32a4196=280+3a2-32a3a2-32a+84=0
Regards,

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