Continuous Issessiner for BUS. 2019 2020 Attempt all questions, time atleed 5mins (15ml)
The duration of Atheimer's disease from the onset of symptoms til death ranges from 3 to 20 year the
average is dyes with a standard deviation of tys. The administrator of a large medical centre randomly selects
the medical records of 30 deceased Alzheimer's patients from the medical centre's data base and record the
average duration. Find the approximate probabilities for these events: (a) The average duration
7yrs (b) The average duration exceeds 7yrs and (c) The average duration lies within 1yr of the population
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At least two people have the same birthday in a school of 150 students

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ac=26 and ch=8, find bh.

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?