In a manual on how to have a number one song, it is claimed that a song must be no longer than 210 seconds. a simple random sample of 20 current hit songs results in a mean length of 234.3 sec and a standard deviation of 54.14 sec. use a 0.05 significance level and the accompanying ti -83 display to test the claim.

Aswimming pool has an input pump for filling the pool and an output pump for emptying the pool. the input pump can fill the pool in 3 hours, and the output pump can drain the pool in 5 hours. as you go to bed, the pool is full, but a neighbor’s kid turns on the output pump. at midnight, you awake to find the pool half empty. immediately, you turn on the input pump, but you are sleepy and forget to turn off the output pump. at what time will the pool become full?

Answer this question only if you know the 30 points and

Lorne subtracted 6x3 – 2x + 3 from –3x3 + 5x2 + 4x – 7. use the drop-down menus to identify the steps lorne used to find the difference.