Question

Standard Deviation Problem Example. Please answer the problems a,b,c, and d listed below. Please demonstrate how you solved these problems. I'd greatly appreciate it. :) Thanks in advance.

The exams scores for a group of freshman biology students are: 31 22 167 189 55 82 75 33 78 79 64 79 182 33 78 62 56 157 60 146 66 180 68 70 77 173 78 69 67 187 94 66 87 7792 75 75 78 62 70 67 69 51 68 185 79 60 47 67 73 90 75 182 76 18893 65 79 75 70 1163 51 73

a ) How many students took the exam?

b) What was the mean exam score? Make sure you follow the rules for significant digits.

c) What was the standard deviation for the class?

d) How many students fall outside +/- 1 standard deviation from the mean?

Answer 1

a)

number of students =63

b)

mean score =69.6

c)

std deviation =15.2

d) 1 std deviation away from mean score =69.6-*15.2 =54.6 to 84.8

number of scores outside this interval =17