In a certain experiment, the data collected is the number of organisms per sample, and this data follows a normal distribution. If the sample of data has a mean of 60 and a standard deviation of 10, which of the following is exactly 1.75 standard deviations more than the mean?  Options:
A) a) 48
B) b) 60
C) c) 72
D) d) 77.5
E) e) 81
Standard Deviation is a relatively rare category in the Quant section, although you're like to be tested on it 1 time on Test Day. You'll never be asked to calculate SD though, so you really just need to learn the basic 'concepts' behind it.   Here, we're told two things about a group of numbers:   1) The average of the group is 60   2) The standard deviation of the group is 10   If you go 1 SDupfrom the average, you hit.....60+10 = 70   If you go 1 SDdownfrom the average, you hit.....60-10 = 50   If you go 2 SDsupfrom the average, you hit.....60+2(10) = 80   If you go 2 SDsdownfrom the average, you hit.....60-2(10) = 40   Etc.   Here, we're asked for the number that is EXACTLY 1.75 SDs above the mean....   1.75 Sd) 77.5supwould be.....60 + 1.75(10) = 77.5   d) 77.5
<result>D</result>
In a certain experiment, the data collected is the number of organisms per sample, and this data follows a normal distribution. If the sample of data has a mean of 60 and a standard deviation of 10, which of the following is exactly 1.75 standard deviations more than the mean?