790 students I subtracted 1495-85 then divided that by two then added the 85 to 705 to get 790
For this case we must solve the following proportion:

Multiplying by 5 on both sides of the equation we have:

Subtracting 2 from both sides of the equation:

ANswer:

Answer:
Step-by-step explanation:
Given that
,
The weibull distribution with parameters 
where 

Then,

A) The probability that a specimen's lifetime is at most 250 is

The probability that the specimen's life time is more than 300 is


= 0.0992
b)The probability of the specimen's lifetime is between 100 and 250

c) The value such that exactly 50% of all specimens have lifetimes exceeding that value is

x = 192.07