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ella [17]
3 years ago
10

Help me solve 7 and 8 please

Mathematics
2 answers:
ratelena [41]3 years ago
6 0

Answer:

1. 3/7 × 8/21= 24/147= 8/49

2. 6/8 + 1/8= 7/8

ycow [4]3 years ago
4 0

Answer:

Step-by-step explanation:     ques no 7

3 / 7×8  / 21  

8   / 49

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IrinaK [193]

The answer to this question is C, I can explain it if you would like.

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Jennifer is taking a four question multiple choice test. Each question has four possible answers. If she completely guesses on a
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Suppose N has a geometric distribution with parameter p. Derive a closed-form expression for E(N | N <= k), k = 1,2,... Check
vfiekz [6]

Answer:

P(X= k) = (1-p)^k-1.p

Step-by-step explanation:

Given that the number of trials is

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1 - p = failure

Hence the distribution is described as: Pr ( FFFF.....FS)

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Pr (X =k) = p(1-p)^k-1, k= 1,2,...k

0, elsewhere

If the probability is defined for Y, the number of failure before a success

Pr (Y= k) = p(1-p)^y......k= 0,1,2,3

0, elsewhere.

Given p= 0.2, k= 3,

P(X= 3) =( 0.2) × (1 - 0.2)²

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3 0
3 years ago
URGENT!!!! The area of a rectangular floor is 80 square feet. The length of the floor is 2 feet less than the width of the floor
KatRina [158]

Answer:

The width of the floor is 10 ft.

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width = w ft

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Given that the area of rectange is A = length × width so you have to subtitute the expressions and value into the formula :

A = l × w

80 = (w - 2) × w

w(w - 2) = 80

w² - 2w = 80

w² - 2w - 80 = 0

(w + 8)(w - 10) = 0

w + 8 = 0

w = -8 (rejected)

w - 10 = 0

w = 10

3 0
2 years ago
Use the drop-down menus to complete the paragraph proof. we are given that xy is parallel to zw. if xz is a transversal that int
adoni [48]

Solution:

x y ║ z w→→Given

Also, x z is a transversal, that intercepts x y and z w.

So, ∠ x z w=∠z x y→→Alternate interior angles as, x y ║ z w.

Also, v is point of intersection of x z and y w.

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So,→→ Δ x y v ~ Δ z w v⇒⇒[Angle-Angle Similarity]




6 0
3 years ago
Read 2 more answers
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