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2 years ago

Please help i will give brainliest to the right answer

Mathematics

1 answer:

elena55 [62]2 years ago

3 0

Step-by-step explanation:

Jacinta is completely right while Tess made a mistake on the 3rd step.

she mistakenly plugged in the y value as X, and plugged in the X value as y.

so Tess is incorrect

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The amount of time Ricardo spends brushing his teeth follows a Normal distribution with unknown mean and standard deviation. Ric

Papessa [141]

Let $X$ denote the number of minutes spent brushing his teeth, and let $\mu$ be the mean and $\sigma$ the standard deviation for this distribution.

$\mathbb P(X$

The z-score corresponding to this probability is approximately $z=-0.2533$ , which means

$\dfrac{1-\mu}\sigma=-0.2533\iff\mu-0.2533\sigma=1$

Next, (note the sign change)

$\mathbb P(X>2)=0.02\implies\mathbb P(X\le2)=\mathbb P\left(\dfrac{X-\mu}\sigma\le\dfrac{2-\mu}\sigma\right)=0.98$

The corresponding z-score is approximately $z=2.0538$ , so you have

$\dfrac{2-\mu}\sigma=2.0538\iff\mu+2.0538\sigma=2$

Solving the two equations for $\mu$ and $\sigma$ , you'll find that the mean is approximately $\mu=1.1098$ and the standard deviation is approximately $\sigma=0.4334$ .

7 0

3 years ago

15 and 16 please help

Ymorist [56]

15.
if he ordered the same amount each month (x) and it is a whole number,
then
12*x=6150, and
x =6150/12 should be a whole number
x=512.5
so 512.5 is not a whole number and the produce company does not agree

16.
16410/138≈118.91
because it not a whole number, she sells pieces for different prices

6 0

3 years ago

A snack mix recipe calls for 2 1/5 cups of grapes and 1/4 cup of cheese. Skyler wants to make the same recipe using 1 cup of che

Sophie [7]

Answer:

8.8

Step-by-step explanation:

You multiply by 4

4 0

3 years ago

Read 2 more answers

A 150 pound woman would recieve 24 grams of a certain medicine. How many grams should a 120 pound woman receive?

eduard

Answer:

This is matter of ratio!

42/150 = x/120. It's 33.6 grams :D

Please Mark Brainliest!!

6 0

4 years ago

Sales of $10,000 increase by 65% each year.<br> Whats the y

Elan Coil [88]

Answer:

153.8 I guess... this is your answer

3 0

3 years ago