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3 years ago

Need help with problem will mark brainliest

Mathematics

1 answer:

BARSIC [14]3 years ago

3 0

Answer:

Step-by-step explanation:

Subtract 4 by 2.5 which is 1.5

Divide 4 by 2.5 which is 1.6

Im not sure if you have to divide or subtract so...

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A distribution of measurements is relatively mound-shaped with a mean of 40 and a standard deviation of 15. Use this information

MArishka [77]

Answer:

The proportion of measurements between 25 and 55

P( 25 ≤ X≤ 55) = 0.6826

Step-by-step explanation:

Step(i):-

Given that the mean of the Population = 40

Given that standard deviation of the Population = 15

Let 'x' be the random variable in normal distribution

Let 'X' = 25

$Z = \frac{x-mean}{S.D} = \frac{25-40}{15} = -1$

Let 'X' = 55

$Z = \frac{x-mean}{S.D} = \frac{55-40}{15} = 1$

Step(ii):-

The probability that between 25 and 55

P( 25 ≤ X≤ 55) = P( -1≤z≤1)

= A(1) - A(-1)

= A(1) + A(1)

= 2 × A(1)

= 2× 0.3413

= 0.6826

The proportion of measurements between 25 and 55

P( 25 ≤ X≤ 55) = 0.6826

Final answer:-

The proportion of measurements between 25 and 55

P( 25 ≤ X≤ 55) = 0.6826

4 0

3 years ago

Maria bought seven boxes. a week later half of her boxes were destroyed in a fire. There are now only 22 boxes left. with how ma

Harman [31]

She started with x boxes.
Then she bought 7 more, so now she has x + 2.
Then half of the boxes were destroyed.
She now has (x + 7)/2.
She has 22 boxes.

(x + 7)/2 = 22

x + 7 = 44

x = 37

She started with 37 boxes.

6 0

3 years ago

a cat and dog shelter houses 23 animals there are 5 more cats x than dogs y. Write and solve a system of linear equations to fin

kkurt [141]

Round 23 to 24 and half it (12) since its rounded up minus 3 (minus 2 if rounded down) = 9

12 + 2 = 14

9 dogs
14 cats

5 0

4 years ago

Read 2 more answers

3x (9-6) +(2x3)= i dont understand this

mojhsa [17]

Answer:

2x^3 + 9 (if you meant the x to be multiplication)

2x^3 + 9x (if you meant the x to be a variable)

Step-by-step explanation:

Hope this helps!

brainliest?

(::)

8 0

3 years ago

(2x^2 - 5x + 3) - (-x2 + 4x - 5) A) x2 - x - 2 B) 3x2 - 9x - 2 C) 3x2 - x + 15 D) 3x2 - 9x + 8

Lelu [443]

Answer:

3x^2 -9x +8

Step-by-step explanation:

Hopefully this attachment will help you!!!

Good luck!!

6 0

4 years ago

Read 2 more answers