A bag is filled with marbles. You take out and mark 80 marbles. Then you put the marbles back in the bag and mix the marbles. In
a sample of 20 marbles, 4 of the marbles are marked. About how many marbles are in the bag?
2 answers:
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Answer:
87.08% percentage of families spend more than $4000 annually on food and drink
Step-by-step explanation:
Given -
average annual expenditure on food and drink for all families is $5700
Mean = 5700
standard deviation = 1500
Let X be the no of families spend annually on food and drink
percentage of families spend more than $4000 annually on food and drink =
=
= Using
= 1 -
= 1 - .1292
= .8708
= 87.08%