5.4. The probability density function of X, the lifetime of a certain type of electronic device, is given by and a) Find P(X > 20). b) What is the cumulative distribution function of X? c) What is the probability that of 6 such types of devices, at least 3 will function for at least 15 hours? What assumptions are you making?

c

step-by-step explanation:

it isn't d, because the interquartile range is from 27-57. and the interquartile range is basically half the data, it's pretty obvious.

it isn't b, because like i said earlier, the interquartile range is from 27-57. 57-27 is 30. the real range has to be longer

not a either. although it looks like it, 3/4 of the data is not greater than 27. but if c is wrong than this should be correct

the correct answer is c, because 13 is the point in which the plot starts

62.5 paisa

step-by-step explanation:

4000*70 = 280000

280000-(2000*90) = 100000

4000-2400 = 1600

100000/1600 = 62.5

( give brainliest)

answer: 486in^2

step-by-step explanation:

it is impossible.