Suppose that X is a normal random variable, with its mean of 3 and its standard deviation of 2. (a) Suppose that David is going to randomly choose a sample of 10 observations from this population. What is the probability that the sample mean of X exceeds 3.2

  0.376

Step-by-step explanation:

Given: X is a normal random variable, with its mean of 3 and its standard deviation of 2.

Sample size : n= 10

The probability that the sample mean of X exceeds 3.2 will be :

Hence, the probability that the sample mean of X exceeds 3.2= 0.376

answer set (b) 0.5, 3/4 80% is in order from least to greatest.  

step-by-step explanation:

in order to compare rational numbers to each other, it is much easier if they are in the same form.   typically, the best form in which to evaluate rational numbers is in decimals.   in order to convert a percent to a decimal, you would divide the given percentage by 100.   you can also accomplish the conversion by moving the decimal point over two places to the left.   for example, the decimal value of 80% is 80/100, or 0.8.   in order to convert a fraction to a decimal, you need to divide the numerator by the denominator.   for example, 3/4 is 0.75.   so, for choice (b) 0.5 3/4 (0.75), 80% (0.8) is the only choice in which the numbers are in order from least to greatest.