Question

Find the Mean of the following numbers a) 1/2, 3 b) 3/4, 1/3 c) -7/2, 5/4 d) -8/5, 7/9​

Answer 1

Answer:

mean=sum of observations/number of observations

a.1/2,3

[1/2+3]/2 =(7/2)/2=7

b.3/4,1/3

[3/4+1/3]/2=(13/12)/2=13/6

c.-7/2,5/4

[-7/2+5/4]/2=(-9/4)/2=-9/2

d.-8/5,7/9

[-8/5+7/9]/2=(-37/45)/2=-37/90

Answer 2

$a) \frac{(\frac{1}{2} + 3)}{2 } \\ = \frac{ \frac{1 + 6}{2} }{2} \\ = \frac{7}{2} \times \frac{1 }{2} \\ = \frac{7}{4} \\ = 1 \frac{3}{7} \\ b) \frac{\frac{3}{4} + \frac{1}{3}}{2} \\ = \frac{ \frac{9 + 4}{12} }{2} \\ = \frac{13}{12} \times \frac{1}{2} \\ = \frac{13}{24} \\ c) \frac{\frac{ - 7}{2} + \frac{5}{4} }{2} \\ = \frac{ \frac{ - 14 + 5}{4} }{2} \\ = \frac{ - 9}{4} \times \frac{1}{2} \\ = \frac{ - 9}{8} \\ = - 1 \frac{1}{8} \\ \\ d) \frac{ \frac{ - 8}{5} + \frac{7}{9} }{2} \\ = \frac{ \frac{ - 72 + 56}{45} }{2} \\ = \frac{ - 16}{45} \times \frac{1}{2} \\ = \frac{ - 8}{45}$

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