On a map, there are 3 centimeters between two cities. The actual distance between the cities is 45 kilometers.
2 answers:
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Answer:
a)
b)
And replacing we got:
c) For this case we want this probability:
But for this case the probability of success is p =1-0.2= 0.8
We can find the individual probabilities and we got:
And replacing we got:
And replacing we got:
Step-by-step explanation:
Previous concepts
The binomial distribution is a "DISCRETE probability distribution that summarizes the probability that a value will take one of two independent values under a given set of parameters. The assumptions for the binomial distribution are that there is only one outcome for each trial, each trial has the same probability of success, and each trial is mutually exclusive, or independent of each other".
Let X the random variable of interest, on this case we now that:
The probability mass function for the Binomial distribution is given as:
Where (nCx) means combinatory and it's given by this formula:
Solution to the problem
Let X the random variable "number of women that have never been married" , on this case we now that the distribution of the random variable is:
Part a
We want to find this probability:
And using the probability mass function we got:
Part b
For this case we want this probability:
We can find the individual probabilities and we got:
And replacing we got:
Part c
For this case we want this probability:
But for this case the probability of success is p =1-0.2= 0.8
We can find the individual probabilities and we got:
And replacing we got: