


Audrey Andrews
Statistics teacher | Experienced educator in USA
Greetings! I'm a passionate educator with a Statistics major from The University of Texas at El Paso. My commitment to fostering understanding spans various subjects. Whether unraveling the intricacies of data analysis or simplifying complex concepts, my goal is to empower students with knowledge. Let's embark on a journey of learning together!
Questions
A set of data contains 200 elements. How do you find the median of the data?
Given 9 starting batters on a baseball team, how many batting orders are possible if the shortstop must bat first and the right fielder must bat fourth?
Suppose that the temperature is normally distributed with expectation 50℃ and variance 4℃.What is the probability that the temperature T will be between 48℃ and 53℃?What is the probability that T≥52℃?
The profit of a small and medium enterprise (SME) has a mean of #£46,000# and standard deviation of #£19,000#. What is the probability that profit of a SME will be between #£40,000# and #£50,000#?
What is the variance of {-13, 10, 8, -3, 6, 12, 7}?
When #n=20# and #p=.2#, what is #P(X <= 12)#?
- What is the standard deviation of {4, 6, 3, 7, 1, 3, 7, 8, 3, 6, 2, 5}?
- The heights of a certain group of adult parrots were found to be normally distributed. The mean height is 36 cm with a standard deviation of 7 cm. In a group of 1200 of these birds, how many would be more than 29 cm tall?
- I'm looking at an example where a poll of different salaries was conducted to estimate the average salary of a region in Canada. Would this be descriptive or inferential?
- He following table shows the probability distribution for a discrete random variable. What is the variance of X?
- Last year a man wrote 142 checks. Let random variable #x# represent the number of checks he wrote in a day, and assume it has a Poisson distribution. What is the mean number of checks written per day?
- How many different arrangements can be made with in the word NUMBER?
- How do overlapping events differ from mutually exclusive events?
- Out of 8 men and 10 women, a committee consisting of 6 men and 5 women is to be formed. How many such committees can be formed when one particular man A refuses to be a member of the committee in which his boss's wife is there?
- How do you find the z-score for having area 0.09?
- The mean annual cost of car insurance is $939. The standard deviation is $300. What is the standard deviation of x-bar?
- What is the average deviation of #1.76, 2.28, 1.90#?
- A correlation of 0.6 means that 60% of the points in the scatter plot lie above the regression line. Is it true or false?
- A jar contains 100 marbles. There are 35 blue marbles, 34 green marbles, 28 red marbles, and 3 yellow marbles. What is the probability of randomly selecting a yellow marble?
- Suppose we represent time endowment (24 hours/day) by H, hours of paid work by L, wage rate per hour, by W, and leisure by ℓ, How to write an expression for the following ?