What is the variance of the following data? If necessary, round your answer to two decimal places.
48, 65, 57, 54, 61, 57, 52, 61, 57

a, 23.43

b. 83.17

c. 71.35

d. 86.43

The table shows the balance of a money market account over time. write a function that represents the balance y (in dollars) after t years.

He weights of 2-pound bags of best dog food are approximately normally distributed with a given mean  and standard deviation  according to the empirical rule, what percentage of the bags will have weights within 3 standard deviations of the mean? 47.5%68%95%99.7%

Ahypothesis is: a the average squared deviations about the mean of a distribution of values b) an empirically testable statement that is an unproven supposition developed in order to explain phenomena a statement that asserts the status quo; that is, any change from what has been c) thought to be true is due to random sampling order da statement that is the opposite of the null hypothesis e) the error made by rejecting the null hypothesis when it is true