Answer:
Step-by-step explanation:
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The sample was 10 numbers.
4 of the numbers are less than 301.
So 4 out of 10 would be defective.
4/10 = 0.4 x 100 = 40%
He would expect 40% to be defective.
Let three consecutive multiples of 7 be 7x,7x+7 and 7x+14
