Choose the one alternative that best complete, the statement or answer, the ques
ID: 3157869 • Letter: C
Question
Choose the one alternative that best complete, the statement or answer, the question. Write the letter corresponding to your chosen answer In the space provided to the left of each question For a standard normal distribution, z = -0.25 indicates: a mistake has been made, because z is always positive a mistake has been made, because z can't be a negative decimal a value that is 1/4 of the mean a value that is relatively close to the mean, but slightly less a value that is relatively close to the mean, but slightly more The location of a subway train is uniformly distributed between 30^th street and 80^th street. The probability of the train being at 50^th street or higher is: 0.40 0.50 0.60 0.42 1.00 In a population of students, the number of calculators owned is a random variable X with P(X = 0) = 0.2, P(X = 1) = 0.6, and P(X = 2) = 0.2. What is the mean of the random variable X? 0.0 2.0 1.0 0.5 The answer cannot be computed because it's not continuous. The expected value of x, also known as mu_x, equals the mean mu_x of the population from which the sample Is drawn: only if the sample size is 30 or greater only if the sample size is 50 or greater only if the population is not skewed only If the population is Normal for any sample size Which of the following,s (are) required condition(s) for a discrete probability sigma f(x) = 0 f(x) greaterthanorequalto 1 for all values of x f(x)Explanation / Answer
1) when the distribution is normal and the z = -0.25 then this indicates that the value will be slightly less then the mean
as the formula is x= mean + z*standad deviation
since z is negative therefore the value of x is less then mean.
hence option D is correct