2 years ago

Does anybody know this ??

Mathematics

1 answer:

Degger [83]2 years ago

3 0

the correct Answer is:

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The scores of the students on a standardized test are normally distributed, with a mean of 500 and a standard deviation of 110.

Gnesinka [82]

Answer:

The probability that a randomly selected student has a score between 350 and 550 = 0.5867

Step-by-step explanation:

Mean $(\nu )$ = 500

Standard deviation $(\sigma )$ = 110

Let X be the score of student in a standardized test

The probability that a randomly selected student has a score between 350 and 550 =

$P(350< X< 550)$ = $P(\frac{ 350 - 500 }{110 }< \frac{ X - \nu }{\sigma }< \frac{ 550 - 500 }{110 } )$

= $P(- 1.36< Z< 0.45 )$ Putting $(Z =\frac{ X - \nu }{\sigma })$

= $(Z< 0.45) - (Z< -1.36)$

= 0.6736 - .0869 ( Using Z table )

= 0.5867

8 0

3 years ago

Mr. Hershman has purchased a farm that is in the shape of a rectangle. The dimensions of the piece of land are 4.74.7 km by 2.58

Gre4nikov [31]

Answer:

Area in square kilometers equals $12.126km^{2}$

Area in hectares equals 1212.6 hectares

Step-by-step explanation:

We know that area of rectangle is length times the breadth.

Using the given values we have

$Area=length\times breadth\\\\\therefore Area =4.7km\times 2.58km\\\\Area=12.126km^{2}$

Thus he bought land of area $12.126km^{2}$

We know that 1 hectare = $0.01km^{2}$

Thus 12.126 $km^{2}$ = 12.126/0.01 hectares

Area in hectares equals 1212.6 hectares

8 0

2 years ago

If x2 = 20. what is the value of x? sqrt 10 sqrt 20 10 40

iren [92.7K]

The answer is sqrt 20

7 0

2 years ago

PLZZZ HELP ASAP THX ❤️ Picture above^^

alina1380 [7]

Answer:12

Step-by-step explanation:

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3 years ago

How many digits are there in the smallest sequence of repeating digits in the decimal equivalent of?

Lilit [14]

I think it is b but wait till someone else answers to

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2 years ago