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3 years ago

Find the area under the standard normal curve to the left of z=1.25.

1 answer:

3 0

For quite some time now, calculators have had statistical functions built in. Here we need to use the stat. function normalcdf, which has only two inputs when we're working with z scores instead of raw scores.

Here,

normalcdf(-100,1.25) = 0.894

This same result could be obtained using a table of z-scores.

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34. Lora is thinking of a number. It is less than 50 It is a 2-digit number. 3 is a factor of this number. The sum of its digits

-Dominant- [34]

Answer:

Step-by-step explanation:

The number is between 10 and 49

The number is divisible by 3

Let the 10s digit = x

Let the units digit = y

1/3 * (10x + y) = x + y multiply both sides by 3

10x + y = 3(x +y) remove the brackets.

10x +y = 3x + 3y Subtract 3x from both sides

10x - 3x + y = 3y Combine\

7x + y = 3y Subtract y from both sides.

7x = 3y - y Combine

7x = 2y

x can't be very big. Even taking 1/3 will get out of range is you use 6.

Also x should be an even number. The units digit cannot have a fraction in it.

Try making x = 2

7*2 = 2*y

14 = 2y Divide by 2

14/2 = y

y = 7

So the number is possibly 27. Let's check it out.

The number is between and includes 10 and 49. 27 is between these two endpoints.
27 is divisible by 3
1/3(27) = sum of digits
9 = (2 + 7)

All of the conditions are met. It's B

8 0

2 years ago

the perimeter of a square clock is 16 6 / 9 inches.The perimeter of a rectangle clock is 16 16/18 inches. Write an inequality co

dlinn [17]

16 16/18 = 16 8/9

so the rectangular clock has a greater perimeter than the square one.

area rectangular clock > area square clock

16 8/9 > 16 6/9

3 0

3 years ago

Leila runs each lap in 6 minutes. She will run less than 9 laps today. What are the possible numbers of minutes she will run tod

avanturin [10]

Answer:

I'm not sure if Leila is allowed to run 0 laps.

6 ≤ t ≤ 48

Step-by-step explanation:

To find the number of possible laps, you just find the smallest possible number and the largest.

1 = smallest

8 = largest

But, you have to multiply by 6 to find the time.

6 ≤ t ≤ 48

8 0

3 years ago

A platinum metal bar measures 5.0 cm long, 4.0 wife, and 1.5 cm thick. It has a mass of 750.0 grams. What is the volume of the p

ioda

Just multiply:
5 cm*(4 cm)*(1.5 cm) = 30 cm^3
The formula of the volume is area of the base by the height.

3 0

3 years ago

If cosA = 3/5 and A ∈ (0,90), what is sin2A?

Hitman42 [59]

Answer:

$\frac{24}{25}$

Step-by-step explanation:

Given

cosA = $\frac{3}{5}$ = $\frac{adjacent}{hypotenuse}$

Then the opposite side using Pythagorean triple is 4, thus

sinA = $\frac{4}{5}$

Using the trigonometric identity

sin2A = 2 sinAcosA, then

sin2A = 2 × $\frac{4}{5}$ × $\frac{3}{5}$

= $\frac{2(4)(3)}{5(5)}$ = $\frac{24}{25}$

3 0

3 years ago

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