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sdas [7]
3 years ago
7

What is the measure of tsq?

Mathematics
1 answer:
grigory [225]3 years ago
3 0
30+2x=3x+5
x=25

edit: sorry for the wrong answer. i messed up
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The mean incubation time of fertilized eggs is 21 days. Suppose the incubation times are approximately normally distributed with
Korvikt [17]

Answer:

a) 20.16; b) 20.49 and 21.51

Step-by-step explanation:

We use z scores for each of these.  The formula for a z score is

z=\frac{X-\mu}{\sigma}.

For part a, we want the 20th percentile; this means we want 20% of the data to be lower than this. We find the value in the cells of the z table that are the closest to 0.20 as we can get; this is 0.2005, which corresponds with a z score of -0.84.

Using this, 21 as the mean and 1 as the standard deviation,

-0.84 = (X-21)/1

-0.84 = X-21

Add 21 to each side:

-0.84+21 = X-21+21

20.16 = X

For part b, we want the middle 39%.  This means we want 39/2 = 19.5% above the mean and 19.5% below the mean; this means we want

50-19.5 = 30.5% = 0.305 and

50+19.5 = 69.5% = 0.695.

Looking these values up in the cells of the z table, we find those exact values; 0.305 corresponds with z = -0.51 and 0.695 corresponds with z = 0.51:

-0.51 = (X-21)/1

-0.51 = X-21

Add 21 to each side:

-0.51+21 = X-21+21

20.49 = X

0.51 = (X-21)/1

0.51 = X-21

Add 21 to each side:

0.51+21 = X-21+21

21.51 = X

4 0
3 years ago
How do you solve this
marusya05 [52]
Hope this helps! Good luck!

3 0
3 years ago
Estimate a 25% tip on a bill of $68.28 by first rounding the bill amount to the nearest ten dollars.
BARSIC [14]

Answer:

A 25% tip on a bill of $68.28 rounded to $70 would be <u>$17.50</u>

STEPS

<em>Step 1: </em>Round $68.28 to $70.00

<em>Step 2:</em> convert 25% to a decimal-------- .25

<em>Step 3:</em> multipy .25 x 70= 17.5

Let me know if you need any other help!!

6 0
3 years ago
What is the answer for the blank?
klemol [59]

Answer:

I think the top would be −72 /7

Step-by-step explanation:

Hope this is right! :) please help on my recent question on history, you get BRAINLYIST AWNSER and 10 points if you answer :/

7 0
3 years ago
A bag contains 15 marbles. The probability of randomly selecting a green marble is 1/3.The probability of randomly selecting a g
WARRIOR [948]
The probability of randomly selecting a red marble is 1/5. You get that by dividing 1/15 by 1/3
5 0
3 years ago
Read 2 more answers
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