Arsenic blood concentrations in healthy adults are Normally distributed with mean µ = 3.2 micrograms per deciliter (µg / dL) and standard deviation σ = 1.5 µg / dL. What is the 90th percentile...

Arsenic blood concentrations in healthy adults are Normally distributed with mean µ = 3.2 micrograms per deciliter (µg / dL) and standard deviation σ = 1.5 µg / dL. What is the 90th percentile...

If female blood pressure is normally distributed with a mean of 114 and standard deviation of 19.8, find p12 and p77

The scores of 2500 students on an exam have an approximately normal distribution with mean of 52 points and standard deviation of 11 points. Estimate how many students more than 52 points. If necessary,...

For a normal distribution with mean μ = 81.2 feet and standard deviation σ = 12.4 feet, find the percent of observations between 68.8 feet and 106 feet.

the answers are either 46-56, 51-61, 46-66, 56-71

I DO NOT KNOW HOW TO SLOVE IT

For a normal distribution with mean μ = 81.2 feet and standard deviation σ = 12.4 feet, find the 16th percentile. Write your answer as a decimal and do not include any units. For a...

Assume that adults have IQ scores that are normally distributed with mean of 105 and standard deviation 15. find P 10 which is the IQ score seperating the bottom 10% from the 90%

Suppose the height of college students is normally distributed with a mean of 70.2 inches and a standard deviation of 5.3 inches. If 50 students from that college are randomly...

The scores of a test given to students are normally distributed with a mean of 21. 80 % of the students have scores less than 23.7. (a) Find the standard deviation of the scores.

a normal distribution has a mean of 20 and a standard deviation of 3. approximately 95% of the distribution can be found between what two numbers?

Which description of normal distributions is correct (select all that apply)? a. Normal distributions have a mean of zero and standard deviation of one. b. Normal distributions...

Consider a normal distribution with a mean of 12 and variance of 4. Approximately 82% of the area lies between which values? a. 6 and 13 b. 10 and 16 c. 9 and 15 d...

Suppose a study finds that the wing lengths of houseflies are normally distributed with a mean of 4.55mm and a standard deviation of about 0.392mm. What is the probability that a randomly selected...

Solve for Z-value and find the area in table then Select: Add or subtract from 50%? 1. above 130 2. below 130 3. above 110

The inside diameter of a manufactured cylinder is believed to follow a normal distribution centered at 5 inches with a standard deviation of .03 inches. The diameter of the cylinder must be within...

If X~N(10,3) and Y~N(15,8), and if X and Y are independent, what is the probability distribution of 1. X +Y 2. X-Y 3. 3X 4. 4X + 5Y If X and Y...

Background info: Flour price is based on weight, which is usually measured in kilograms. The flour seller has noted that the weights of the flour stocked by her supermarket are normally distributed...

The average time a customer spends waiting in the check-out line at Wal-Mart is seven minutes. If wait times are independent and constant, what is the probability the customer will spend between eight...

Mean x¯= 120, standard deviation is 25, find the area or percentage; solve for Z-value and find the area in table then Select: Add or subtract from 50%? a. above 130 b...

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