A normal model has a mean = 230 and a standard deviation = 15.
Find the following: P(x < 210)
What is 0.0918
100
The z score corresponds to a cumulative area of 0.3520
What is -0.38
100
Find the z score that corresponds to percentile 35
What is -0.39
100
52% of adults say chocolate chip is their favorite cookie. You randomly choose 40 adults. Find the probability that at most 23 people say chocolate chip is their favorite cookie.
What is 0.7580
200
Area to the right z = -0.63
What is .7357
200
A normal model has a mean = 135 and a standard deviation = 10.4.
Find the following : P(x > 146)
What is 0.1446
200
Find the z score that has 78.5% of the distribution's area to its right.
What is -0.79
200
Find the z score that corresponds to the first quartile
What is -0.67
200
52% of adults say chocolate chip is their favorite cookie. You randomly choose 40 adults. Find the probability that at least 18 people say chocolate chip is their favorite cookie.
What is .8133
300
P(-2.46 < z < 1.75)
What is 0.953
300
A normal model has a mean = 86 and a standard deviation = 5.
Find the following: P(85 < x < 95)
What is 0.5434
300
Find the z score for which 80% of the distribution's area lies between -z and z.
What is -1.28 and 1.28
300
A normal distribution has a mean = 52 and a standard deviation = 2.5. Find the x value that represents the 95th percentile.
What is 56.1
300
11% of all Americans are left handed. You randomly select 50 Americans. Find the mean, variance and standard deviation.
What is 5.5, 4.895, 2.21
400
Find the area for P(z < .46) or P(z > 2.85)
What is 0.6794
400
A normal model has a mean = 17.1 and a standard deviation = 4. What x value represents the 75th percentile?
What is 19.78
400
A normal distribution has a mean = 127 and a standard deviation = 23.5. Find the x value that would correspond to the top 30%.
What is 139.22
400
A normal distribution has a mean = 290 and a standard deviation = 37. Find the x value that represents the the 25th percentile.
What is 265.2
400
11% of all Americans are left handed. You randomly select 50 Americans. Find the probability that at most 9 Americans are left handed.
What is .9429
500
Find the area under the curve that lies within one standard deviation from the mean.
What is .6826
500
A normal model has a mean = 11.4 and a standard deviation = 3. Find the x value that represents the 5th percentile.
What is 6.47
500
A normal distribution has a mean = 20 and a standard deviation = .07. Find x value would correspond to the bottom 5%
What is 19.88
500
If a normal distribution has a mean = 290 and a standard deviation = 37. Find the percent that corresponds to an x value greater than 250.
What is .8599 = 85.99%
500
11% of all Americans are left handed. You randomly select 50 Americans. Find the probability that between 4 and 7 Americans are left handed