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3 years ago

On a standardized exam, the scores are normally distributed with a mean of 250 and

Mathematics

1 answer:

fredd [130]3 years ago

7 0

Answer:

the z-score is within 3

Step-by-step explanation:

first you got to take the standard deviation and add it to the mean since 375 is greater than 250. so the equastion would be

250+50=300+50=350+50=40

so the z-score for the value of 375 is within 3

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Which one is a polynomial ? it’s not B!!

Alina [70]

A probably i dont know

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3 years ago

The perimeter of a quarter circle is 17.85 miles. What is the quarter circle’s radius?

siniylev [52]

Answer:

8.1

Step-by-step explanation:

The perimeter of a circle means the circumference. In this question it says the perimeter of a quarter circle is 17.85 miles and we want to find the quarter circle’s radius.

We know that the perimeter of the quarter circle is 17.85 which means that the 2 radii and the circumference of the circle sum to 17.85.

The formula to work out the perimeter of a quarter circle is $2r+\frac{\pi }{2}$ . We can form an equation to work out the radius so,

$2r+\frac{\pi }{2}$ = 17.85

→ Multiply everything by 2 to get rid of the fraction

4r + π = 35.7

→ Minus π from both sides to isolate 4r

4r = 32.55840735

→ Divide both sides by 4 to isolate 4

r = 8.139601837

The radius of the quarter circle is 8.1 miles to 1 decimal place

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3 years ago

A real estate agent has 18 properties that she shows. She feels that there is a 40% chance of selling any one property during a

algol13

Answer:

Probability of selling no more than 3 properties in one week is 42%

Step-by-step explanation:

With 18 properties to sell and 40% chance of selling any one, it means that she can sell 7.2 properties (18 x 40%) in a week.

To sell no more than 3 properties in one week, the probability will be 3/7.2 x 100 = 0.4167

Probability is the chance of one event taking place out of many events. It is calculated as the number of the one event taking place divided by the total number of events. It is expressed in decimal or percentage form.

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4 years ago

Two sides of a rectangle are 10 and 6cm each. Calculate the area of a square with the same perimeter as that of the rectangle

KengaRu [80]

Answer: 64 cm ²

Step-by-step explanation:

The perimeter of this rectangle will be:

= 2 * Length + 2 * Width

= 2 * 10 + 2 * 6

= 20 + 12

= 32 cm

The square has the same perimeter. Squares have 4 equal sides so each side of the square must be:

= 32 / 4

= 8 cm

Area = Length * Width

= 8 * 8

= 64 cm ²

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3 years ago

Identify the zeros for the function and sketch a graph. y=x(x-2)(x+3)

damaskus [11]

The product is equal to zero if one of the factors is equal to zero.

Therefore:

$y=x(x-2)(x+3)\\\\x(x-2)(x+3)=0\iff x=0\ \vee\ x-2=0\ \vee\ x+3=0\\\\\boxed{x=0\ \vee\ x=2\ \vee\ x=-3}$

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4 years ago