The average amount of money that people spend at Don Mcalds fast food place is $7.8400 with a standard deviation of $1.9200. 12 customers are randomly selected. Please answer the following questions, and round all answers to 4 decimal places where possible and assume a normal distribution. a. What is the distribution of X? X ~ N( b. What is the distribution of ? a ~ N( c. What is the distribution of æ? > x ~ N(
Continuous Probability Distributions
Probability distributions are of two types, which are continuous probability distributions and discrete probability distributions. A continuous probability distribution contains an infinite number of values. For example, if time is infinite: you could count from 0 to a trillion seconds, billion seconds, so on indefinitely. A discrete probability distribution consists of only a countable set of possible values.
Normal Distribution
Suppose we had to design a bathroom weighing scale, how would we decide what should be the range of the weighing machine? Would we take the highest recorded human weight in history and use that as the upper limit for our weighing scale? This may not be a great idea as the sensitivity of the scale would get reduced if the range is too large. At the same time, if we keep the upper limit too low, it may not be usable for a large percentage of the population!
![The average amount of money that people spend at
Don Mcalds fast food place is $7.8400 with a
standard deviation of $1.9200. 12 customers are
randomly selected. Please answer the following
questions, and round all answers to 4 decimal places
where possible and assume a normal distribution.
a. What is the distribution of X? X ~ N(
b. What is the distribution of ? ~ N(
c. What is the distribution of x? > x ~ N(
d. What is the probability that one randomly
selected customer will spend more than
$8.5486?
e. For the 12 customers, find the probability that
their average spent is more than $8.5486.
f. Find the probability that the randomly selected
12 customers will spend less than $102.5832.
g. For part e) and f), is the assumption of normal
necessary?
h. The owner of Don Mcalds gives a coupon for a
free sundae to the 2% of all groups of 12 people
who spend the most money. At least how much
must a group of 12 spend in total to get the free
Yes
No
sundae? $](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F0ff74ff6-9c03-481d-a05b-af985401f030%2F92ba2b53-00a8-4d8a-84da-cc5e76316ea2%2F573ckob_processed.jpeg&w=3840&q=75)
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