The sampling distribution of 50 randomly selected people will follow a normal distribution with:
Mean = 21.1
s = 5.1/√50 = 0.72
We have to find: P(X > 23) = P( z > (23 - 21.1)/0.72 ) = P(z > 2.64)
From the z-table,
P(z > 2.64) = 1 - P(z < 2.64) = 1 - 0.9959 = 0.0041
The average ACT score follows a normal distribution with a mean of 21.1 and a standard...
Q3: The score of IQ has a normal distribution. Suppose the average IQ score is 110 and the standard deviation is 15. a. What is the IQ score that is 1.5 standard deviations higher than the average and what proportion of people exceed that score? b. A person is selected at random. What is the probability that his/her IQ score is between 95 and 140? 20.1587 = 1 and 20.0668 = 1.5 and 20.0228 = 2 and 20.0013 = 3
The average price of a new iPhone is $800. Assume the price follows a normal distribution with a standard deviation of $50. 1. What is the probability that a randomly selected iPhone sells for less than $750? 2. What is the probability that a randomly selected iPhone sells for more than $880? 3. What is the probability that a randomly selected iPhone sells between $770 and $840?
A random variable follows the normal probability distribution with a mean of 80 and a standard deviation of 20. Determine the probability for a randomly selected value from this population in parts a through d below. a. is less than 90 b. is less than 65 c. is more than 110 d. is more than 40.
The average time taken to complete an exam, X, follows a normal probability distribution with mean = 60 minutes and standard deviation 30 minutes. What is the probability that a randomly chosen student will take more than 45 minutes to complete the exam?
The national average SAT score is 1028. If we assume a normal distribution with a standard deviation of 92. What is the probability that a randomly selected score is less then 1100
Find the indicated z score. The graph depicts the standard normal distribution with mean 0 and standard deviation 1. 13) Shaded area is 0.9599. A) - 1.38 B) 1.03 1.82 D) 1.75 14) Shaded area is 0.0694. A) 1.45 B) 1.26 1.48 D) 1.39Find the indicated value. 15) z0.005 A) 2.535 D) 2.015 92.835 B) 2.575 16) z0.36 A) 1.76 B) 0.45 1.60 D) 0.36 Provide an appropriate response. 17) Find the area of the shaded region. The graph depicts IQ scores of adults, and those scores are normally distributed...
Question 9 1 pts The scores on Quiz 2 follows the normal distribution with a mean of 8 and a standard deviation of 0.5. What is the probability that a randomly selected student has a score between 8 and 10? 0.95 0.96 ..50 0.99
Let us assume that the variable Total_Rooms follows the normal distribution with mean 87 and standard deviation 95.1. Then: 4.1 Compute the probability that a randomly selected hotel has more than 100 rooms. 4.2 Compute the probability that a randomly selected hotel has between 60 and 80 rooms. 4.3 Find what is the minimum number of rooms a hotel should have in order to be considered in the 20% of the largest in size?
Let us assume that the variable Total_Rooms follows the normal distribution with mean 87 and standard deviation 95.1. Then: 4.1 Compute the probability that a randomly selected hotel has more than 100 rooms. 4.2 Compute the probability that a randomly selected hotel has between 60 and 80 rooms. 4.3 Find what is the minimum number of rooms a hotel should have in order to be considered in the 20% of the largest in size?
Question 6 1 pts The scores on Quiz 2 follows the normal distribution with a mean of 8 and a standard deviation of 0.5. (Round your answers to two decimal places). What is the probability that a randomly selected student has a score above 8? 0.95 0.05 O.50 0.45