Assume that a sample is used to estimate a population proportion p. Find the margin of error M. E. that corresponds to a sample of size 177 with 25 successes at a confidence level of 80%.
M. E. -
(report answer accurate to one decimal place; answer should be reported as a percent, not a decimal-
though do not type the percent sign)
Answer should be obtained without any preliminary rounding. However, the critical value may be rounded
to 3 decimal places.

Aspacecraft can attain a stable orbit 300 kilometers above earth if it reaches a velocity of 7.7 kilometers per second. the formula for a rocket's maximum velocity v in kilometers per second is vequalsminus0.0098tplusc ln upper r, where t is the firing time in seconds, c is the velocity of the exhaust in kilometers per second, and r is the ratio of the mass of the rocket filled with fuel to the mass of the rocket without fuel. find the velocity of a spacecraft whose booster rocket has a mass ratio of 20, an exhaust velocity of 2.1 km/s, and a firing time of 15 s. can the spacecraft achieve a stable orbit 300 km above earth?