# Gabriel Allred

Statistics teacher | Verified Expert

With a Statistics major from The University of Texas Health Science Center at San Antonio, my passion lies in demystifying numbers and fostering a deep understanding of mathematical concepts. As an experienced tutor, I excel in breaking down complex statistical theories into digestible bits, empowering students to conquer any data-related challenge. My approach focuses on personalized guidance, tailored to individual learning styles, ensuring every student reaches their full potential. Let's embark on a journey of statistical mastery together.

## Questions

How many 4-digit numbers can be made that are divisible by 4 if we have the digits 2, 4, 5, 6, 7 and for each number we can only use each digit once?

Given a set # {13, x ,-1, 11} #, for what x would the mean of the set be 3?

The commuting time for all employees of a company has a normal distribution with a mean of 44.6 minutes and a standard deviation of 11.2 minutes. What is the probability that the mean computing time by a sample of 12 employees is between 43.26 and 49.35?

The probability that a seed will germinate is 0.34. Suppose 130 seeds are planted. How do you use the central limit theorem to determine the probability that at most 37 seeds germinate?

Can someone help me with this contingency table??

In a class test where the mean was 62% and the standard deviation 12.6%, bob received 50%. What is his z-score?

What is the test statistic and the p-value for the following sample: H0: μ = 60 versus H1: μ _= 60, α = .025, ¯x = 63, σ = 8, n = 16?

A student must answer 3 out of 5 essay questions on a test. In how many different ways can the student select the question?

De Guzman Co. Claims that the average life of their battery product last of 26 hours with a standard deviation of 5 hours. What is the probability that 35 random pieces of their batteries have an average life span of less than 24.3 hours?

Three manufacturing plants, say I, II and III, produce 20, 30 and 50 percent of a company’s output respectively. What is the probability that a randomly-chosen item from the company’s warehouse is defective?

What is the purpose of hypothesis testing in statistics?

What are the mean and standard deviation of a binomial probability distribution with #n=11 # and #p=7/30 #?

What is the z-score of sample X, if #n = 256, mu= 17, St. Dev. =80, and mu_X =22#?

The probability that a DVD player produced by VCA Television is defective is estimated to be 0.07. A sample of ten players is selected at random. What is the probability that the sample contains no defective units?

If the mean, median, and mode are all equal for the set {3,4,5,8,x}, what is the value of x?

How do you make a box and whisker plot with the following numbers: 89, 122, 154, 163, 179, 204, 217, 258, 272, 291, 300, 302, 415, and 452?

Why do we have to use "combinations of n things taken x at a time" when we calculate binomial probabilities?

What is the difference between the R-Squared and adjusted R-Squared when running a regression analysis?

There are n identical cards of type A, n of type B, n of type C, and n of type D. There are 4 persons that each have to receive n cards. In how many ways can we distribute the cards ?

You have the numbers 1-24 written on a slip of paper. If you chose one slip at random what is the probability that you will not select a number which is divisible by 6?