The Mean = (135 + 71 + 69 + 80 + 158 + 152 + 161 + 96 + 122 + 118 + 87 + 85 ) : 12 = 111.166

The smallest value : 69

The greatest value : 161

s² = ∑( x i - x )² / ( n - 1 )

s² = ( 568.274 + 1613.3 + 1777.97 + 971.32 + 2193.42 + 1667.4 + +2483.42 + 230 + 117.38 + 46.7 + 584 + 684.66 ) : 11

s² = 1176.1676

s = √s² = √1176.1676

s ( Standard deviation ) = 34.295

All the values fall within 2 standard deviations:

x (Mean) - 2 s and x + 2 s

he ended up multiplying the 7 by the 2 for some reason.

and an explanation could be he used the reciprocal of both numbers mistakenly.

What do you think the answer is? Tell me and I will help you some more! :)

<span>2 4/5 divided by 1 1/3

= 14/5 divided by 4/3

= 14/5 * 3/4

= 42/20

= 21/10

= 2 1/10

Final Answer: 2 1/10</span>