QUESTION 19 A random variable x equals the number of courses for which a typical student...
Let x be the number of courses for which a randomly selected student at a certain university is registered. The probability distribution of x appears in the table shown below: x 1 2 3 4 5 6 7 p(x) .03 .05 .09 .26 .39 .14 .04 (a) What is P(x = 4)? P(x = 4) = (b) What is P(x ≤ 4)? P(x ≤ 4) = (c) What is the probability that the selected student is taking at most five...
QUESTION 15 The random variable X, representing the number of accidents in a certain intersection in a week, has the following probability distribution: 1 2 3 P(X=x) 0.35 0.25 0.20 0.10 0.05 0.05 On average, how many accidents are there in a week? 025 0.80 1.40 2.00
1. Xis a normally distributed random variable with a mean of 12 and a standard deviation of 3. Calculate the probability that x equals 19.62. 2. A simple random sample of 8 employees of a corporation provided the following information 25 32 26 54 22 23 Determine the point estimate for the average age of all employees. What is the point estimate for the standard deviation of the population? Determine a point estimate for the proportion of all employees who...
Let X be a normal random variable with mean 4 and variance 9. Use the normal table to find the following probabilities, to an accuracy of 4 decimal places. Normal Table The entries in this table provide the numerical values of Φ(z)=P(Z≤z), where Z is a standard normal random variable, for z between 0 and 3.49.For example, to find Φ(1.71), we look at the row corresponding to 1.7 and the column corresponding to 0.01, so that Φ(1.71)=.9564. When z is...
The number of successes and the sample size for a simple random sample from a population are given below. X=7, n=28, Hop=0.2, H. p> 0.2, a=0.05 a. Determine the sample proportion b. Decide whether using the one proportion z-test is appropriate. c. If appropriate, use the one proportion z-test to perform the specified hypothesis test. Click here to view a table of areas under the standard normal curve for negative values of z. Click here to view a table of...