A computer repair shop has estimated the probability that a computer sent to the shop has a bad modem is the probability that the computer has a bad CPU is and the probability that it has a bad drive s. If we assume that modems, CPUS, and drives are independent, find the probability of the following. (Enter your probabilities as fractions.) (a) A modem, CPU, and a drive in a computer sent to the shop are bad. 1/64 (b) Only a modem and a CPU in a computer sent to the shop are bad. 3/64 (c) None of the three parts (modem, CPU, or drive) is bad. 21/64 Additional Materials
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.
![**Problem: Probability and Independence of Computer Parts**
A computer repair shop has estimated the probability that a computer sent to the shop has a bad modem is \( \frac{1}{2} \), the probability that the computer has a bad CPU is \( \frac{1}{8} \), and the probability that it has a bad drive is \( \frac{1}{5} \).
If we assume that modems, CPUs, and drives are independent, find the probability of the following. (Enter your probabilities as fractions.)
a) A modem, CPU, and a drive in a computer sent to the shop are bad.
\[ \frac{1}{64} \] ❌
b) Only a modem and a CPU in a computer sent to the shop are bad.
\[ \frac{3}{64} \] ❌
c) None of the three parts (modem, CPU, or drive) is bad.
\[ \frac{21}{64} \] ❌
---
**Explanation:**
This problem involves calculating probabilities under the assumption that the states of the modem, CPU, and drive are independent events. We calculate the probability of combined events using the product of individual probabilities for independent events.
- For part (a), multiply the individual probabilities:
\(\frac{1}{2} \times \frac{1}{8} \times \frac{1}{5} = \frac{1}{80}\).
- For part (b), calculate the probabilities assuming only the modem and CPU are bad. This involves:
\(\frac{1}{2} \times \frac{1}{8} \times \left(1 - \frac{1}{5}\right) = \frac{1}{16} \).
- For part (c), calculate the probability that none of the parts are bad:
\((1 - \frac{1}{2}) \times (1 - \frac{1}{8}) \times (1 - \frac{1}{5}) = \frac{7}{40}\).
Note that the answers provided in the problem attempt are incorrect, as indicated by the red crosses. Correct calculations should be aligned with the explanation given above.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F280b87a4-ff0a-41b7-8564-c1007684f1cf%2F78da9c76-b2ff-4244-8626-09ceba02268c%2Fxmjqcrw_processed.jpeg&w=3840&q=75)
Trending now
This is a popular solution!
Step by step
Solved in 3 steps with 3 images
