Steve loves to watch sailing regattas over the summer (a regatta is a sporting event consisting of a series of boat races). The regatta he is watching has 10 sailboats in the race. Suppose that each of the sailboats start racing at the same time and the time it takes each to finish is an independent exponential random variable with a mean of 30 minutes. Steve will stop watching after the first 5 sailboats cross the finish line. If T is the amount of time Steve is watching the race. (a) Find E[T].
(b) Find Var(T).

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step-by-step explanation:

hello,

b) 62.47% of the students are between 14 and 18 years old.

step-by-step explanation:

mean = 15 and standard deviation = 2

student between 14 to 18

formula used z-score

for age 14 , z score

using z-table , p(z> -0.5)=0.3085

for age 18 , z score

using z-table , p(z< 1.5)=0.9332

p(-0.5< z< 1.5)=0.9332-0.3085 = 0.6247

thus, 62.47% of the students are between 14 and 18 years old.

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step-by-step explanation:

too many. (jk)

31 v bucks

step-by-step explanation:

since you bought 25 on friday and 6 on tuesday, you can just add them up.

25+6=31

check your work.

31-6=25

i hope this !

-yand3r3

55 degrees because 55+55=110 degrees