Topic : Statistics-Standard Deviation
1.
2.
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1.Understanding
Think about the definition of standard deviation.
(1)There is no way to find the SD from the info because we have no idea how much they are apart.

(2)If they have same number of eggs, SD is 0.

Ans: B

2.Mathematical Reading
Which data has more distance from the mean?

Ans: D

1.
The point is to find when he starts withdrawals.
1. C
Understanding
The point is to find when he starts withdrawals.
(1) Doesn't start to withdrawal until May 15th.
There are two possible balance for April.
$2480 or $2650 based on balance on May.

(2)He didn't deposit on June 15th.
If he deposite the money on June, it should be more than $2675.
so, he started withdrawals on June.