The rental rate for a cement mixer has a flat rate of $40 plus $20 for each day of the rental. The graph shows points representi
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Given:
Number of people bought tickets for comedy =
Number of people bought tickets for horror =
Number of people bought tickets for kids movie =
To find the number of people who bought tickets for the action movie.
Let us take,
Total number of tickets = 1
Now,
Total number of tickets for comedy, horror and kids movie are =
So,
LCM of 5,4,10 = 20
=
=
Rest are action movie's tickets.
Therefore,
Number of action movie tickets =
=
=
Hence,
The number of people who bought the tickets for action movie is .
Let 
be the random variable for the part's diameter, and 
the same variable transformed into one that follows the standard normal distribution. You're looking for the proportion of the parts that lie 2 standard deviations away from the mean, which translates to
Recall the empirical rule, which says that approximately 95% of a normal distribution falls within 2 standard deviations of the mean, or
. This means
So out of 15000 parts, you should expect about 5% of them, or about 750 parts to be rejected.
Recall the empirical rule, which says that approximately 95% of a normal distribution falls within 2 standard deviations of the mean, or
So out of 15000 parts, you should expect about 5% of them, or about 750 parts to be rejected.