Q. The lifetime of a 2-volt non-rechargeable battery in constant use has a Normal distribution with a mean of 516 hours and a standard deviation of 20 hours. 90% of all batteries have a lifetime less than
A. 517.28 hours. B. 536.00 hours. C. 541.60 hours.
Q. The lifetime of a 2-volt non-rechargeable battery in constant use has a Normal distribution with a mean of 516 hours and a standard deviation of 20 hours. The proportion of batteries with lifetimes exceeding 520 hours is approximately.
A. 0.2000. B. 0.5793. C. 0.4207.
Q. When ordering vinyl replacement windows, the following variables are specified for each window. Which of these variables is quantitative?
A. Window style - Double hung, casement, or awning
B. Area of the window opening in square inches
C. Window style - Single pane or double pane
Q. You receive a fax with six bids (in millions of dollars) 2.2, 1.3, 1.9, 1.2, 2.4, and x,
where x is some number that is too blurry to read. Without knowing what x is, the median
A. is 1.9. B. must be between 1.3 and 2.2. C. could be any number between 1.2 and 2.4.
Q. A distribution has a mean of 100 and a median of 120. The shape of this distribution is most likely
A. skewed left. B. skewed right. C. symmetric.