A group of science students plans to take SRS of 25 days in the year to see what proportion of days sampled have a low below 0 °C in particular city. suppose that 41% of days in the city have a low temperature below 0 °C. Let p-hat represent the proportion of a sample of 25 days with a low temperature below 0 °C.
What are the mean and standard deviation of the sampling distribution of p-hat?
Choose 1

A) up=(365)(0.41)
op= check mark 365(0.41)(1 - 0.41)
B) up=0.41
op= check mark 0.41(1 - 0.41)/25
C) up= (25)(0.41)
op=check mark 25(0.41)(1 - 0.41)
D)up= 0.41
op=check mark 0.41(1 - 0.41)/365

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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?