Based on the Normal model for car speeds (in km/h) on a road N(77,9.1) ,what are the cutoff values for the middle 70% of the speeds?

A) about 60.2 km/h,about 93.7 km/h
B) about 70.2 km/h,about 83.1 km/h
C) about 67.5 km/h,about 86.5 km/h
D) about 23.1 km/h,about 130.9 km/h
E) about 50.1 km/h,about 103.9 km/h

What are the three null hypotheses used in a 2 × 2 factorial analysis?

For the sign test,n equals the number of differences in the sample that are ____________________.

Evaluate the answer correct to the cent:
$\frac{\$5000}{(1+0.04{)}^2}$

Find the n th partial sum of the arithmetic sequence. $8,13,18,23,28,\dots ,n=12$

A) 390
B) 438
C) 426
D) 354
E) 402

Novell Electronics recently bought a patent that will allow it to bring a new product to market in 2½ years. Sales forecasts indicate that the product will increase the quarterly profits by $28,000. If the patent cost $150,000, how long after the date of the patent purchase will it take for the additional profits to repay the original investment along with a return on investment of 15% compounded quarterly? Assume that the additional profits are received at the end of each quarter.