The distribution of battery life of MacBook laptops is normally distributed with a mean of 8.4 hours and a standard deviation of 1.2 hours. The distribution of Dell laptops is normally distributed with a mean of 7.1 hours with a standard deviation of 0.75 hours. Required:
a. Calculate the probability that a randomly selected MacBook laptop battery lasts more than 9 hours.
b. Calculate the probability that a randomly selected Dell laptop battery lasts be- tween 5 and 8 hours.
c. How long must a MacBook laptop battery last to be in the top 4%?
d. How long must a Dell laptop battery last to be at the 40th percentile?
e. Calculate the probability that a randomly selected MacBook laptop lasts longer than the 25th percentile of Dell laptops.
f. A randomly selected laptop has a battery life of at least 8.0 hours. Calculate the probability of this laptop being a MacBook and the probability of it being a Dell.

62.5 paisa

step-by-step explanation:

4000*70 = 280000

280000-(2000*90) = 100000

4000-2400 = 1600

100000/1600 = 62.5

( give brainliest)

so a parallelogram is just like a square base times height. multiply 40 and 39 to get 1560 inches.

a triangle is base times height divided by two. so multiply 7.9 and 5 and then divide it by 2 to get 19.75inches.

the kite can be split into two separate triangles and added together to get the total area. 30 x 4 /2 which equals 60. make sure to double it for the two triangles making 120.

guess at question:

a vertical line intersects the graph of g(x,y) = 0 at two points. what conclusion follows about the function f(x) implicitly defined by g(x,f(x)) = 0?

the domain of f(x) cannot include the x coordinate of any such vertical line.

informally, f(x) is not a function, and

g(x,y)=0 cannot be solved for y uniquely.

the relation r = {(x,y) such that g(x,y) = 0} is a function if

for all (a,b) ∊ r and (c,d) ∊ r, a=c implies b=d.

step-by-step explanation: