e. What is the probability that an account is less than 2 years old and has a balance of $1000 or more? f. What is the probability that an account is at least 2 years old given that the balance is $500–$999?
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 e and f
![The checking accounts of Sun Bank are categorized by the age of account and the account
balance. Auditors will select accounts at random from the following 1000 accounts (num-
bers in the table are the number of accounts in each category):
Account Balance
Age of the Account
0–$499
$500–$999
$1000 or More
240
Less than 2 years
2 years or more
120
75
90
200
275
a. What is the probability that an account is less than 2 years old?
b. What is the probability that an account has a balance of $1000 or more?
c. What is the probability that two accounts will both have a balance of $1000 or more?
d. What is the probability that an account has a balance of $500–$999 given that its age
is 2 years or more?
What is the probability that an account is less than 2 years old and has a balance of
$1000 or more?
e.
f. What is the probability that an account is at least 2 years old given that the balance is
$500–$999?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fe653ab87-c95a-46a3-92c4-aa9ab58a4d19%2F7a6a7e2e-1b32-4dcd-a480-fda314599a3e%2Fps4gyup_processed.png&w=3840&q=75)
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