1) As reported by the FBI, the age distribution of murder victims is shown in the following table. Age(yr) Frequency 20 -24 2834 25 -29 2262 30 -34 1649 35 -39 1257 40 -44 1194 45 -49 938 50 -54 708 55 -59 384 A murder case in which the person murdered was between 20 and 59 years old is selected at random. Find the probability that the murder victim was a) between 40 and 44 years old, inclusive. b) at least 25 years old, that is, 25 years old or older. c) between 45 and 59 years old, inclusive. d) under 30 or over 54
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.
1) As reported by the FBI, the age distribution of murder victims is shown in the following table.
Age(yr) Frequency
20 -24 2834
25 -29 2262
30 -34 1649
35 -39 1257
40 -44 1194
45 -49 938
50 -54 708
55 -59 384
A murder case in which the person murdered was between 20 and 59 years old is selected at random. Find the probability that the murder victim was
- a) between 40 and 44 years old, inclusive.
- b) at least 25 years old, that is, 25 years old or older.
- c) between 45 and 59 years old, inclusive.
d) under 30 or over 54
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