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A company is studying the number of monthly absences among its 125 employees. The following probability distribution shows the likelihood that people were absent 0, 2, 4, 6, 8, or 11 days last month. Number of days absent Probability 0 0.30 2 0.27 4 0.05 6 0.30 8 0.08 11 0 What is the mean number of days absent?
0.08 0.19 0.91 3.18
A random sample of 81 credit sales in a department store showed an average sale of $68.00. From past data, it is known that the standard deviation of the population is $27.00.
a researcher is interested in estimating the noise levels in decibels at area urban hospitals. she wants to be 90
The following frequency distribution reports electricity cost for sample of 50 two-bedroom apartments in Albuquerque, New Mexico during the month of May last year.
give an example of global sustainability that demonstrates your understanding of the
According to the Chebyshev rule, at least what percentage of the observation in any data set are contained within a distance of 3 standard deviations around the mean.
1.assuming the population is large which sample size will give the smallest standard deviation to the statistic?a.n
for a normal distribution curve with a mean of 17 and a standard deviation of 5 which range of the variable defines an
A researcher plans a study in which a crucial step is offering participants a food reward. It is important that the three food rewards be equal in appeal.
If the population standard deviation is $7, and a random sample of 50 properties is chosen, what is the probability that the sample average will be below $35?
One of the 4 bus drivers is also randomly selected. Let Y denote the number of students on his bus. Compute the expectations and variances of X and Y?
If the shop does not want to give more than 1% of its customers a free lube and oil change service, how long should the guarantee be?
in a cohort breast cancer study a woman is considered to be exposed if she first gave birth at age 30 or older. in a
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