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den301095 [7]
3 years ago
12

Please help y’all i dont’t know this one !??!!!!??

Mathematics
1 answer:
castortr0y [4]3 years ago
8 0

Answer:

a,b,c,e let me be for sure have to go check dont try it

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Example 1: Calculation of Normal Probabilities Using ????????-Scores and Tables of Standard Normal Areas The U.S. Department of
Molodets [167]

Answer:

i) 0.872

ii) 0.300

iii) 0.76

iv) 0.704

Step-by-step explanation:

We are given the following information in the question:

Mean, μ =  $261.50 per month

Standard Deviation, σ = $16.25

We are given that the distribution of monthly food  cost for a 14- to 18-year-old male is a bell shaped distribution that is a normal distribution.

Formula:

z_{score} = \displaystyle\frac{x-\mu}{\sigma}

a) P(Less than $280)

P( x < 280) = P( z < \displaystyle\frac{280 - 261.50}{16.25}) = P(z< 1.138)

Calculation the value from standard normal z table, we have,  

P(x < 280) = 0.872 = 87.2\%

b) P(More than $270)

P(x > 270)

P( x > 270) = P( z > \displaystyle\frac{270 - 261.50}{16.25}) = P(z > 0.523)

= 1 - P(z \leq 0.523)

Calculation the value from standard normal z table, we have,  

P(x > 270) = 1 - 0.700 = 0.300 = 30.0\%

c) P(More than $250)

P(x > 250)

P( x > 250) = P( z > \displaystyle\frac{250 - 261.50}{16.25}) = P(z > -0.707)

= 1 - P(z \leq -0.707)

Calculation the value from standard normal z table, we have,  

P(x > 250) = 1 - 0.240 = 0.76 = 76.0\%

d) P(Between $240 and $275)

P(240 \leq x \leq 275) = P(\displaystyle\frac{240 - 261.50}{16.25} \leq z \leq \displaystyle\frac{275-261.50}{16.25}) = P(-1.323 \leq z \leq 0.8307)\\\\= P(z \leq 0.8307) - P(z < -1.323)\\= 0.797 - 0.093 = 0.704 = 70.4\%

P(240 \leq x \leq 275) = 70.4\%

e) Thus, 0.704 is the probability  that the monthly food cost for a randomly selected 14- to 18-year-old male is between $240 and $275.

5 0
3 years ago
Write 0.0000000068 as a scientific notation
Y_Kistochka [10]

Answer:

10×6.8 to the 9th power

3 0
3 years ago
Pls help will mark as brainliest
Annette [7]

Answer:

The last one

Step-by-step explanation:

when you are dividing an equation with exponents, you subtract the exponents from each other.

For example, in your problem you have d^4 and d^2 (notice that they have the same base)  you subtract the exponents to get d^2

** even if the bases are numbers, you DONT touch the base, just the exponents ( ex.: 5^4 ÷ 5^3  = 5^1)

Do this w/ the rest of the exponents.

d^4 ÷ d^2 =  d^2

e^3÷e^2= e

f^5÷f= f^4

** although f looks like it doesn't have an exponent, it has an invisible one

And w/ the power of deduction, you should get -2/3 d^2ef^4

3 0
3 years ago
I need a help in figuring out how to graph
Nuetrik [128]
The x variable is the first number in the parentheses. (X,Y) so you would go to -2 on the X axis(the horizontal line) and then go up 5 which is the y axis
7 0
2 years ago
Help me please I really need help.If its correct I will mark u brainiest and rate it five stars and like it
Alchen [17]

Answer:

8 Cubes. A Prism should be at least double the height so at least 8 more cubes on top of the 8. Can you tell me the height, it will help if I know the height

Step-by-step explanation:

5 0
3 years ago
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