Find the probability that a single randomly selected value is less than 39. P(X < 39) = answer is not .4325

Assume a standardized IQ test exists that possesses a normal distribution and has a mean score of 100 with a standard deviation of 10 What is the probability of selecting someone from the general population at random who would

About 73% of all female heart transplant patients will survive for at least 3 years. Sixty female heart transplant patients are randomly selected. What is the probability that the sample proportion surviving for at least 3 years will be less than 64%? Assume the sampling distribution of sample proportions is a normal distribution. The mean of the sample proportion is equal to the population proportion and the standard deviation is equal to pq n The probability that the sample proportion surviving for at least 3 years will be less than 64% is (Roun to four decimal places as needed.)

Suppose the average amount of money that people spend on their pets per month is 47 dollars, with a standard deviation of 6 dollars.  For a sample of 36 people, final the average amount of money spent on pets that defines the bottom 30% in the distribution.For a sample of 36 people, what is the probability for this sample’s mean to be higher than 50 dollars.

Suppose that the scores on a reading ability test are normally distributed with a mean of  70  and a standard deviation of  8 . What proportion of individuals score at least  76  points on this test? Round your answer to at least four decimal places.

If the standard deviation of the population is σ, the standard deviation of the sample means is where "n" is the number of observations in each sample. True False

Suppose we know that the mean score among the population of college students taking the GMAT test is 1000.  If the population standard deviation is 1200, and we take a sample of size 100, then what percentage of possible sample means that could be drawn from this population will be less than 1300?

A normally distributed population has a mean equal to 85 and a standard deviation equals 4.0. If a sample of size 49 is selected what is the probability that the sample mean will be less than 73 or greater than 97?

Assume a standardized IQ test exists that possesses a normal distribution and has a mean score of 100 with a standard deviation of 10. What is the probability of selecting someone from the general population at random who would

A particular fruit's weights are normally distributed, with a mean of 483 grams and a standard deviation of 23 grams.If you pick 17 fruits at random, then 16% of the time, their mean weight will be greater than how many grams