by step deviation method
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Answer:
mean=7.09
Step-by-step explanation:
class marks:
1,3,5,7,9,11,13
a:
-6, -4, -2, 0,2,4,6
h:-3, -2, -1, 0,1,2,3
xifi:
-3, -4, -1, 0,6,,4,9=9
total=20
mean=a+h(xifi/total)
=7+2(9/20)
=7+9/10
=7+0.9
=7.09
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