n s 2: pnaFromthepeevious expenence it as known that 70% of all engineering grad

Question

n s 2: pnaFromthepeevious expenence it as known that 70% of all engineering graduates get a pb w thin months of their graduation. In an Engineering college 25 students ili a What is the preobability that more than 15 students will get a job within six months of their In an Engineering college 25 students will graduate this semester What are the mean and standard deviation of this distribution Suppose on average 10 people visit a particular web site per minute. What is the probabili en 20 and 25 (inclusive) people will visit this website in the next 3 minutes?

Explanation / Answer

P= 0.7 , n = 25

a) p =15/25 = 0.6

P(p >0.6)
z = ( p - P) / sqrt(P * ( 1 -P)/n)
= ( 0.6 - 0.7)/ sqrt(0.7 *0.3/25)
= - 1.1785

P(p > 0.6) = P(z > -1.1785) = 0.8808

b)
mean = np =25 * 0.7 = 17.5
std.dev . = sqrt(P * ( 1 -P)/n)
          = sqrt(0.7 *0.3/25)
          = 0.0848

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