IQs Suppose that IQs of East State University’s studentscan be described by a Normal model with mean 130 and standard deviation 8 points. Also suppose that IQs of stu-dents from West State University can be described by a Normal model with mean 120 and standard deviation 10.a) We select a student at random from East State.Find the probability that this student’s IQ is at least125 points.b) We select a student at random from each school. Findthe probability that the East State student’s IQ is atleast 5 points higher than the West State student’s IQ.c) We select 3 West State students at random. Find theprobability that this group’s average IQ is at least125 points.d) We also select 3 East State students at random. What’sthe probability that their average IQ is at least 5 pointshigher than the average for the 3 West Staters?
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.
can be described by a Normal model with mean 130 and
dents from West State University can be described by a
Find the probability that this student’s IQ is at least
125 points.
b) We select a student at random from each school. Find
the probability that the East State student’s IQ is at
least 5 points higher than the West State student’s IQ.
c) We select 3 West State students at random. Find the
probability that this group’s average IQ is at least
125 points.
d) We also select 3 East State students at random. What’s
the probability that their average IQ is at least 5 points
higher than the average for the 3 West Staters?
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