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Mila [183]
3 years ago
11

The time it takes to train a newly hired telephone sales representative is normally distributed with a mean of 136 hours and a s

tandard deviation of 8.9 hours. what is the probability that training for a given individual will last between 130 and 140 hours?
Mathematics
1 answer:
jasenka [17]3 years ago
7 0
Using z-scores for 130 and 140 hours, and a standard normal distribution table, the cumulative probabilities for 130 and 140 hours are 0.254 and 0.673 respectively.
The required probability is 0.673 - 0.254 = 0.42 to 2 d.p.
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A population of sea turtles decreases by 25% per year. The population size is currently 1,024. Which expression calculates the p
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The expression calculates the population x years from now will be given as y = 1024 (0.75)ˣ.

<h3>What is an exponent?</h3>

Consider the function:

y = a (1 ± r) ˣ

Where x is the number of times this growth/decay occurs, a = initial amount, and r = fraction by which this growth/decay occurs.

If there is a plus sign, then there is exponential growth happening by r fraction or 100r %

If there is a minus sign, then there is exponential decay happening by r fraction or 100r %

The population of sea turtles decreases by 25% per year. The population size is currently 1,024.

Let y be the population of sea turtles and x be the number of years.

Then we have

y = 1024 (1 - 0.25) ˣ

y = 1024 (0.75) ˣ

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4 0
2 years ago
According to the Tristate Transportation Authority, making certain improvements to the main commuter rail line would increase ri
serious [3.7K]

Answer:

Options A and B are true

(A) Before the authority increases tolls on any of the area bridges, it is required by law to hold public hearings at which objections to the proposed increase can be raised.

B. (B) Whenever bridge tolls are increased, the authority must pay a private contractor to adjust the automated toll-collecting machines.

Step-by-step explanation:

A. In a developed society, it's imperative for the authority to hold public hearings with stake holders to air their views before the tolls are increased, this would enable the authority to carry out proper assessment to know both the positive and negative impact of increasing the toll.

B. Increasing the tolls implies that there must be adjustment in the automated tolling machines and this would incur cost on the authority, this contract would be executed by private contractors.

3 0
4 years ago
E = {m_0} c^2/ \sqrt{1 - {v^2}/{c^2}}
wel

Answer:

tu solo tienes que ver qué la respuesta vaya junto a la pregunta

8 0
3 years ago
How to find the unknown measure of a rectangle whose area is 91 and width is 7.
motikmotik

Answer:

Length of rectangle= 13

Step-by-step explanation:

Area= Length × width

91= length × 7

length= 91 ÷7 = 13

5 0
3 years ago
The ____________________ school, led by naturalist john muir, wanted wilderness areas on some public lands to be left untouched.
Vanyuwa [196]

The  preservation/list school, led by naturalist John muir, wanted wilderness areas on some public lands to be left untouched.

<h3>What does it mean if a person is a naturalist?</h3>

A naturalist lifestyle is a term that connote that a person is making or developing values that makes or forms empathy and caring in regards to nature.

Therefore, The  preservation/list school, led by naturalist John muir, wanted wilderness areas on some public lands to be left untouched.

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