(1 point) Consider a normal distribution curve where 60-th percentile is at 11 and the 25-th...
(1 point) Consider a normal distribution curve where 55-th percentile is at 12 and the 10-th percentile is at 4. Use this information to find the mean, ?μ , and the standard deviation, ?σ , of the distribution.
Consider a normal distribution curve where 80-th percentile is at 16 and the 45-th percentile is at 1. Use this information to find the mean, μ , and the standard deviation, σ , of the distribution. a) μ= b) σ=
Consider a normal distribution curve where 85-th percentile is at 15 and the 35-th percentile is at 7. Use this information to find the mean, μ , and the standard deviation, σ , of the distribution.
(1 point) Consider a normal distribution curve where the middle 90 % of the area under the curve lies above the interval ( 3·11 ) Use this information to find the mean, μ , and the standard deviation, σ , of the distribution. Note: You can earn partial credit on this problem.
(1 point) Consider a normal distribution curve where the middle 75 % of the area under the curve lies above the interval (6, 15). Use this information to find the mean, u , and the standard deviation, o , of the distribution. a) u = b) o = Here is a list of some cities' population: 74769000, 1500, 76162000, 78176000, 79748000 The mean of these cities' population is The median of these cities' population is Which number, mean or median,...
Consider a normal distribution curve where the middle 20 % of the area under the curve lies above the interval ( 7 , 20 ). Use this information to find the mean, ? , and the standard deviation, ?, of the distribution.
Consider a normal distribution with mean 25 and standard
deviation 5. What is the probability a value selected at random
from this distribution is greater than 25? (Round your answer to
two decimal places.)
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 = 14.9; σ = 3.5
P(10 ≤ x ≤ 26) =
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1. About % of the area under the curve of the standard normal distribution is outside the interval z=[−0.91,0.91]z=[-0.91,0.91] (or beyond 0.91 standard deviations of the mean). 2. Assume that the readings at freezing on a batch of thermometers are normally distributed with a mean of 0°C and a standard deviation of 1.00°C. A single thermometer is randomly selected and tested. Find P11, the 11-percentile. Round to 3 decimal places. This is the temperature reading separating the bottom 11% from...
11) (2 marks) The graph of a normal curve is given on the right. a) Use the graph to find the values of mean and the standard n: Standard Deviation: Use the empirical rule to find the probability that the x value b) will be between -11 and -5.
11) (2 marks) The graph of a normal curve is given on the right. a) Use the graph to find the values of mean and the standard n: Standard Deviation: Use...
1. Use Table A to find the proportion of observations from a standard Normal distribution that satisfies each of the following statements. In each case, sketch a standard Normal curve and shade the area under the curve that is the answer to each question. a. z<-1.83 b.z > 2.18 c. Z>-0.51 d. z <0.33 e. 1.42<z <2.68 f.-2 <2<1.53 X is a normally distributed variable with mean u = 30 and standard deviation o = 4. Find the following: a....