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3 years ago

Evaluate. –228 + 384 + (–189)

1 answer:

5 0

First collect the like terms together= -228+-189+384
then work out=-228+-189+384
=-417+384
=-33
the answer is -33
hope i helped

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What is the same value as 32 tens the picture blary I don't no why

Natalka [10]

The answer you are looking for is 320

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4 years ago

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Stewie has 4 cups of milk. How many pints of milk does Stewie have?

lesantik [10]

Answer:

2 pints

Step-by-step explanation:

1 pint = 2 cups

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3 years ago

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Civil engineers believe that W, the amount of weight (in units of 1000 pounds) that a certain span of a bridge can withstand wit

chubhunter [2.5K]

Answer:

x ≥ 117

Step-by-step explanation:

Let suppose Pₙ denoted the structural damage that is probable with n cans

Pₙ = P {X₁+ ....... + Xₙ ≥ w}

= P {X₁+ ....... + Xₙ-w ≥ 0 }

So weight of the ith can denoted by Xi

From CLT , ΣXi is normal with 3n and variance 0.09

w is independent of Xi and normal

ΣXi-w is also normal

then mean and variance are

E [ ΣXi - w] = 3n -400

Var (ΣXi-w) = var (ΣXi) +Var (w)

= 0.09n +1600

So Pₙ = P{ X₁ +X₂ +.... +Xₙ -w-(3n-400) /underroot 0.09n +1600 ≥ -(3n-400)/ understoot (0.09n +160v)

this can be simplified to≈ P₀ { Z ≥ 400 - 3n / undersoot (0.09n+1600)}

P{Z ≥ 1.28 } ≈ .1

on simplifying x ≥ 117

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3 years ago

The data below contain the number of defects observed on each of 250 lcd screens.0 1 2 4 5 5 3 4 3 4 4 2 2 1 0 2 1 3 4 1 4 5 1 2

nika2105 [10]

Answer:

0.128 ; 0.872 ; 0.748 ; 0.124 ; 0.252

Step-by-step explanation:

Given the data above ;

The frequency distribution generated for the number of defects observed on each of 250 lcd screens are as follows :

__number of defects___frequency

____0 _______________24

____1 _______________82

____2 _______________38

____3 _______________43

____4 _______________31

____5 _______________26

____6 _______________6

A.) . What proportion of the screens have more than 4 defects? Give your answer to three decimal places.

More than 4 defects = (number of 5 defects + 6 defects) / total number of defects)

(26 + 6) / 250 = 32 / 250 = 0.128

b. What propotion of the screens have at most 4 defects? Give your answer to three decimal places.

Number of (0 + 1 + 2 + 3 + 4) defects

= (24 + 82 + 38 + 43 + 31) / 250

= 218 / 250 = 0.872

c. What proportion of the screens have fewer than 4 defects? Give your answer to three decimal places.

Number of (0 + 1 + 2 + 3) defects

= (24 + 82 + 38 + 43) / 250

= 187 / 250 = 0.748

d. What proportion of the screens have exactly 4 defects? Give your answer to three decimal places.

Number of 4 defects = 31

= 31 / 250

= 0.124

e. What proportion of the screens have at least 4 defects? Give your answer to three decimal places.

Number of (4 + 5 + 6) defects

= (31 + 26 + 6) / 250

= 63 / 250

= 0.252

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4 years ago

Factor each:<br> x^8-13x^4+36=0

Hoochie [10]

Answer:

Step-by-step explanation:

a = x^4

a^2 - 13a +36 = 0

(a-4)*(a-9)=0

a = 4, a = 9

x^4 = 4, x^4 = 9

x = + or - 4th root of 9 and 4

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3 years ago