1 answer:
A,
lower stated limit of class123 to 125 = 123
upper stated limit of class123 to 125 = 125
b.
lower stated limit of class129 to 131 = 129
upper stated limit of class129 to 131 = 131
c,
lower real limit of class123 to 125 = 122.5
upper real limit of class123 to 125 = 125.5
d.
lower real limit of class129 to 131 = 128.5
upper real limit of class129 to 131 = 131.5
e. mid-point of class interval 120 to 122 is 121
f.
What does 'i' refer to? I am not familiar with the terminology you use. I can answer in comment.
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