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Doing a stat lab. Need to know if the average of test scores and average spent on pupils is a discrete or continuous variable and I keep confusing myself trying to figure it out.

1) a drawer contains 6 white socks and 8 black socks. if two socks are chosen randomly from the drawer, what is the probability they will be of the same color?   2)Box A contains 4 red...

x1,x2,...~Geometric(p) independent. 0<p<1. N = min{n|∑(i to n) X(i)≥5000} How to calculate EN?

Researchers investigated whether increased body mass index was a risk factor for prostate cancer. In the Health Professionals Follow-Up Study, 51,529 male US health professionals aged between 40 and...

Assume that x has a normal distribution with the specified mean and standard deviation. Find the indicated probability. (Round your answer to four decimal places.) μ = 5.2; σ = 0.9 P(7 ≤ x...

Sketch the area under the standard normal curve over the indicated interval and find the specified area. (Round your answer to four decimal places.) The area between z = −2.14 and z =...

Sketch the area under the standard normal curve over the indicated interval and find the specified area. (Round your answer to four decimal places.) The area to the left of z = −1.22...

A company’s manufacturing process uses 500 gallons of water at a time, a scrubbing machine then removes most of the chemical pollutant before pumping the water into a lake. Legally the...

Let z be a random variable with a standard normal distribution. Find the indicated probability. (Round your answer to four decimal places.) P(−1.10 ≤ z ≤ 2.44) =

Sketch the area under the standard normal curve over the indicated interval and find the specified area. (Round your answer to four decimal places.) The area to the right of z = 1.45

Researchers investigated whether increased body mass index was a risk factor for prostate cancer. In the Health Professionals Follow-Up Study, 51,529 male US health professionals aged between 40 and...

A survey was conducted in an HIV clinic to estimate the prevalence of condom use in HIV-positive individuals. Two hundred individuals were surveyed and questionnaires were received back from 100....

The scores on a test given to all juniors in a school district are normally distributed with a mean of 74 and a standard deviation of 8. Find the percent of juniors whose score is no more than 90...

Suppose Y ∼ N(μ=0, σ). Find σ so that the normal population contains 90% of its probability between -1 and 1. Please round your answer to two decimals. . [Hint: The normal distribution...

We have the daily impressions, and an average bid per 1000 impressions

For a group of 10 army recruits, the weight (in lbs) and exercise capacity (in METS) were recorded. Weight:  125 159 150 161 178 182 191 200 224 250   Exercise Capacity: 30...