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Suppose the average number of complaints received by Christina hospital for patients is 7.4 every 4 weeks. Assume the number of complaints per month follow the poison distribution, what is the probability of exactly 4 complaints during the next 4 weeks?
You check the weather forecast on average it is raining 20 percent of the time. Consider the next 5 days. What is the probability it will be raining 1 day? What is the probability it will raining at most 2 days?
The average battery life of the iphone 4s is reported to be 6.0 by apple. assume that the population standard deviation for the better life for this cell phone is 30. a random sample of 50 iphone had an average better life of 5.7 hours. Determine the (margin of error in hours) for the 90 percent confidence interval for this sample.
consider the following discrete probability distribution
X P(X)
0 .2
1 .3
2 .4
3 .1
total = 1
Calculate the mean of this distribution
Calclate the variance of this distribution.
