number 7
Unitary Method
The word “unitary” comes from the word “unit”, which means a single and complete entity. In this method, we find the value of a unit product from the given number of products, and then we solve for the other number of products.
Speed, Time, and Distance
Imagine you and 3 of your friends are planning to go to the playground at 6 in the evening. Your house is one mile away from the playground and one of your friends named Jim must start at 5 pm to reach the playground by walk. The other two friends are 3 miles away.
Profit and Loss
The amount earned or lost on the sale of one or more items is referred to as the profit or loss on that item.
Units and Measurements
Measurements and comparisons are the foundation of science and engineering. We, therefore, need rules that tell us how things are measured and compared. For these measurements and comparisons, we perform certain experiments, and we will need the experiments to set up the devices.
![13. Knowina that
6. Roll a fair &8-sided die 10 times. The probability of getting exactly 3 sevens in those 10 rolls is given by
10
dmun si n
(a)
3
bns blods
(b)
8
P(X=3)
and t
8.
(d)
(e)
3
8.
8
LE00 20.011.0 020 CE.0 AC0 (1
7. Let the random variable X represent the profit made on a randomly selected day by a certain store. Assume
that X is approximately Normal with mean $360 and standard deviation $50. The most profitable 10% of days
have a profit of at least how many dollars?
(a) $244
(b) $296
(c) $370
(d) $424
(e) $476
8. Which of the following is a true statement?
(a) The binomial setting requires that there are only two possible outcomes for each trial, while the
geometric setting permits more than two outcomes.
(b) A geometric random variable takes on integer values from 0 to n.
(c) If X is a geometric random variable and the probability of success is 0.85, then the probability
distribution of X will be skewed left, since 0.85 is closer to 1 than to 0.
(d) An important difference between binomial and geometric random variables is that there is a fixed
number of trials in a binomial setting, and the number of trials varies in a geometric setting.
(e) The distribution of every binomial random variable is skewed right.
Use the following for problems 9 and 10. The number of DVDS rented daily at DVD rental machine has a mean
of 134 with a standard deviation of 42.
What a](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F5abcbf60-d485-4461-88d0-26c4d37454a4%2F5fe642a5-e247-4f1c-9266-0c389b7dff41%2Fiukjgo_processed.jpeg&w=3840&q=75)
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The z score can be calculated as:
The required z score that is associated with the top 10% can be obtained by using the standard normal table. The value of z at p = 0.10 is 1.28.
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