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2 years ago

5

Scores on a standardized test are normally distributed with a mean of 250 and a standard a deviation of 20. Approximately what p

ercent of students scored between 260 and 280? Round to the nearest percent

1 answer:

masha68 [24]2 years ago

5 0

Answer:

You can't answer this properly without more data.

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Sandra will get 10 pounds

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3 years ago

!!Please help!! This is algebra and I don't understand

Shkiper50 [21]

Answer:

To understand this, bags of gas added make it go up, while bags of sand added make it go down:

1). Add bags of gas | balloon goes UP | 3 bags of gas ( +3 ), 10 bags of sand ( +10 )

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3). Subtract bags of gas | balloon goes <u>DOWN</u> | subtract 3 bags of gas <u> </u><u>-</u><u> </u>(<u> </u><u>+</u><u>3</u><u> </u>), subtract 10 bags of gas <u> </u><u>-</u><u> </u>(<u> </u><u>+</u><u>1</u><u>0</u><u> </u>)

4). Subtract bags of sand | balloon goes <u> </u><u>U</u><u>P</u><u> </u> | subtract 3 bags of sand <u> </u><u>-</u><u> </u>(<u> </u><u>-</u><u>3</u><u> </u>), subtract 10 bags of sand <u> </u><u>-</u><u> </u>(<u> </u><u>1</u><u>0</u><u> </u>)

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3 years ago

One way a parallelograhm and a rhombos are diffrent

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A parallelogram does not need to have all its sides equal. It just needs two pairs of equal opposite sides. A rhombus on the other hand, has to have all its four sides equal. A rhombus is actually a special form a parallelogram. So, a rhombus is always a parallelogram but a parallelogram is not always a rhombus.

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3 years ago

You are building a shelf that fits in a corner in the figure the entire shelf is XYZ each unit in the coordinate plane represent

horsena [70]

Answer:

$Area = 112.5$

Step-by-step explanation:

Given

$X = (15,20)$

$Y = (15,5)$

$Z = (0,5)$

Required

Determine the area of the triangle

The area is calculated using the following formula:

$Area = |\frac{X_x(Y_y - Z_y) + Y_x(X_y - Z_y) + Z_x(X_y - Y_y)}{2}|$

Where

$(X_x,X_y) = (15,20)$

$(Y_x,Y_y) = (15,5)$

$(Z_x,Z_y)= (0,5)$

Substitute right values in the given formula:

$Area = |\frac{15(5 -5) + 15(20 - 5) + 0(20 - 5)}{2}|$

$Area = |\frac{15(0) + 15(15) + 0(15)}{2}|$

$Area = |\frac{0 + 225 + 0}{2}|$

$Area = |\frac{225}{2}|$

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$Area = 112.5$

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