Waiting time for all passengers waiting for the arrival for an Amtrak train follows a uniform distribution from 10 minutes to 46 minutes, with a mean of 28 minutes and standard deviation of 10.4 minutes. 1. Suppose one passenger will be selected at random. Which of the following distributions would we use to find the probability that one randomly selected passenger will wait no more than 32
Addition Rule of Probability
It simply refers to the likelihood of an event taking place whenever the occurrence of an event is uncertain. The probability of a single event can be calculated by dividing the number of successful trials of that event by the total number of trials.
Expected Value
When a large number of trials are performed for any random variable ‘X’, the predicted result is most likely the mean of all the outcomes for the random variable and it is known as expected value also known as expectation. The expected value, also known as the expectation, is denoted by: E(X).
Probability Distributions
Understanding probability is necessary to know the probability distributions. In statistics, probability is how the uncertainty of an event is measured. This event can be anything. The most common examples include tossing a coin, rolling a die, or choosing a card. Each of these events has multiple possibilities. Every such possibility is measured with the help of probability. To be more precise, the probability is used for calculating the occurrence of events that may or may not happen. Probability does not give sure results. Unless the probability of any event is 1, the different outcomes may or may not happen in real life, regardless of how less or how more their probability is.
Basic Probability
The simple definition of probability it is a chance of the occurrence of an event. It is defined in numerical form and the probability value is between 0 to 1. The probability value 0 indicates that there is no chance of that event occurring and the probability value 1 indicates that the event will occur. Sum of the probability value must be 1. The probability value is never a negative number. If it happens, then recheck the calculation.
Answer question 3
![Waiting time for all passengers waiting for the arrival for an Amtrak
train follows a uniform distribution from 10 minutes to 46 minutes,
with a mean of 28 minutes and standard deviation of 10.4 minutes.
1. Suppose one passenger will be selected at random. Which of the
following distributions would we use to find the probability that
one randomly selected passenger will wait no more than 32
minutes for an Amtrak train? [ Select ]
2. Complete the following statement:
For a random sample of 75 passengers, the
[ Select ]
follow(s) approximately a normal
(28, 1.2) distribution.
3. Suppose we now take a random sample of 40 passengers instead
of 75. What effect, if any, does this decrease in sample size have
on the mean of 28 minutes for the normal distribution stated
above v [ Select ]
Decrease
Remain unchanged
Increase](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F2b31a72c-6450-4a72-9d6f-7562259052d5%2F19b5f49d-e39a-4b16-b492-c1ae229d83e2%2Fhd0ro6_processed.png&w=3840&q=75)
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