The average electric bill in a residential area is $72 for the
month of April.
The standard deviation is $6. If the amounts of the electric bills
are normally distributed,
find the probability that
(a) the amount of bill (X) for a randomly selected resident will
be less than $74;
(b) the mean amount ( ̄X) of the bill for a random sample of 36
residents will be less
than $74.
The average electric bill in a residential area is $72 for the month of April. The standard deviation is $6. If the amou
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The average electric bill in a residential area is $72 for the month of April. The standard deviation is $6. If the amou
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