Geologists estimate the time since the most recent cooling of a mineral by counting the number of uranium fission tracks on the surface of the mineral. A certain mineral specimen is of such an age that there should be an average of 6 tracks per cm^2 of surface area. Assume the number of tracks in an area follows a Poisson distribution. Let X represent the number of tracks counted in 1 cm^2 of surface area. Find:(a) P(X = 7)(b) P(X ≥ 3)(c) P(2 < X < 7)(d) μX(e) σX

a) 0.138

b) 0.938

c) 0.544

d) 6

e) 2.45

Step-by-step explanation:

Let X represent the number of tracks counted in 1 cm^2 of surface area.

The estimated average is 6 tracks per cm^2. This is the parameter λ of the Poisson distribution.

The expression for the Poisson distribution is

Then

a) x=7

b) x≥3

c) 2<x<7

d) and e)

450

step-by-step explanation:

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i believe the correct answer is option 4.principalities were small territories that were run by russian rulers.

which statement correctly defines principalities in northern asia in the 1200s? principalities were small territories that were run by russian rulers.

hope i could ! : )