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What percent of the eruptions last longer than 2.3 minutes?

The mean test score was 850 with a standard deviation of 100.  What porportion of students had a higher score than Vivian? (Assume that test scores are normally distributed.)

How would I go about answering these questions? Also, how do you differentiate between solving them as a dependent or an independent event?   Let P(A) = .3, P(B) = .4 and P( A ∪ B...

With a distribution of 10 scores, nine of them are 3, 5, 9, 1, 9, 2, 0, 3, and 9. The last one is greater than 5 but it is not 9.  Is it possible to determine the mean of the distribution?

An experiment tests whether or not dogs can detect cancer by sniffing 7 urine vials, one of which was from a cancer patient. When the hypothesis is tested that the dogs randomly guess, H0: p = 1/7,...

During September, the average temperature of Laurel Lake is 64.2° and the standard deviation is 3.2°. Assume the variable is normally distributed. For a randomly selected day in September, find the...

The mean consumption of beef at the turn of the century was 70 pounds per person per year in the US.  A sample of 32 people taken this year yielded the following data, in pounds, on last years...

In an August 2012 Gallup survey of 1,012 randomly selected U.S. adults (age 18 and over), 53% said that they were dissatisfied with the quality of education students receive in kindergarten through...

A variable is normally distributed with mean 68 and standard deviation 10. Find the percentage of all possible values of the variable that: a. Lie between 73 and 80 b. Are at most 90

Determine the area under the standard normal curve that lies between: a. -0.88 and 2.24 b. -5.1 and 1

MY WRONG ANSWER: mean, median, mode . CHOICES: mean, median, mode                 mode, median, mean                ...

Given the following information, what can we conclude.    Religious affiliation in the United States(Rounded)   Evangelical Protestant 26% Catholic    ...

How do I calculate the standard deviation when given the mean and percent of area that lies to left of a given value?   Specifically mean=10.8 and 15% of area lies to the left of 9.3.  What...

i need to find the 10%condition of this: 33% of 75 name brand chickens are contaminated and 45% of 75 generic chickens are contaminated, what is the 10% condition?

The weight of people in a small town in Missouri is known to be normally distributed with a mean of 186 pounds and a standard deviation of 29 pounds. On a raft that takes people across the river,...

1. Compute for the mean, median, and mode of the lengths of mosquitoes' lives in seconds after being sprayed with Insecticide A.   13     14     23     22...

I'm getting confused about this things: 1. My teacher said that Nominal,Ordinal,Interval and Ratio has their own appropriate measures of location. for example: For Nominal the appropriate measures...

Assume σ is known. What are the critical values for testing Hο: µ=200 against H¹: µ ≠ 200 with α = 0.04 ? a. ±1.41 b.±2.05 c.±1.67 d.±1.75

The mean being 176 days and the standard deviation being 12

These are two different questions.