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Talja [164]
3 years ago
7

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

Mathematics
1 answer:
snow_tiger [21]3 years ago
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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Teresa worked for 13 hours each day for 5 days. Then the next day she worked 9 hours. How many hours did Teresa work in all?
shtirl [24]

Answer:

74

Step-by-step explanation:

13 x 5 is 65. 65 + 9 is 74.

3 0
2 years ago
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How to find the vertex of a parabola given a quadratic equation?
Nat2105 [25]
let \: f(x) = ax {}^{2} + bx + c \\ thus \: f(x) \: represents \: a \: parabola \: whose \: axis \: is \: parallel \: to \: the \: y \: axis \: and \: vertex \: is \: \frac{ - b}{2a} ,\frac{ - d}{4a} \\

At the respective max and min values

8 0
3 years ago
The Ferris wheel is the most popular ride. In 1 hour, the Ferris wheel had 240 riders. If that was 60% of the total number of ri
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Answer:

400 riders

Step-by-step explanation:

The Ferris wheel had 400 riders.

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4 0
3 years ago
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Azul spun a tri-color spinner twice. What is the probability that the spinner landed on the colors blue and green in any order?
guapka [62]

Answer:

The Probability that the spinner landed on the colors blue and green in any order = 2/9

Step-by-step explanation:

Given - Azul spun a tri-color spinner twice.

To find - What is the probability that the spinner landed on the colors blue and green in any order?

Solution -

Given that,

A tri-color spinner spun twice

So,

The Sample Space, S = {BB, BG, BY, GB, GG, GY, YB, YG, YY}

⇒n(S) = 9

Now,

Let A be an event that the spinner landed on the colors blue and green

So,

A = {BG, GB}

⇒n(A) = 2

Now,

Probability that the spinner landed on the colors blue and green in any order = n(A) ÷ n(S)

         = 2 ÷ 9

∴ we get

The Probability that the spinner landed on the colors blue and green in any order = 2/9

8 0
3 years ago
What is a number between 7.833 and 7.834
dalvyx [7]

7.8335 is a number between 7.833 and 8.834

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