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svetoff [14.1K]
3 years ago
9

WILL MARK BRAINLIEST !!!

Mathematics
2 answers:
djverab [1.8K]3 years ago
8 0
I’ve attached my work
Hope it helps

Finger [1]3 years ago
5 0

Answer:

2:5

Step-by-step explanation:

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The lengths of pregnancies are normally distributed with a mean of 269269 days and a standard deviation of 1515 days. a. Find th
kati45 [8]

Answer:

a. 0.38%

b. 266.75 days

Step-by-step explanation:

We have the following data, mean (m) 269 and standard deviation (sd) 15, therefore:

a. The first thing is to calculate the number z:

z (x) = (x - m) / sd

z (309) = (309-269) / 15 = 2.67

When looking in the normal distribution table (attached), we have that at this value of z, the probability is:

P (z> 2.67), that is to say we must look in the table -2.67 and this value corresponds to 0.0038, that is to say 0.38%

b. Find the z-value with a left tail of 44%, i.e. 0.44. We look in the table for this value and what value of z corresponds.

invNorm (0.44) = -0.15

Find the corresponding number of days:

x = z * sd + m

we replace

d = -0.15 * 15 + 269 = 266.75 days

7 0
3 years ago
Anjali's Bikes rents bikes for $15.24 plus $2.61 per hour. Kathryn paid $30.90 to rent a bike. For how many hours did she rent t
tensa zangetsu [6.8K]
Kathryn rented the bike for about 1.7 hours.
7 0
3 years ago
Read 2 more answers
Which is the difference of 21 1/4 - 18 2/4? A:2 1/4. B:2 2/4. C:2 3/4. D:3 1/4.
seropon [69]

Answer:

2 3/4 C

Step-by-step explanation:

(21+\frac{1}{4})-(18+\frac{2}{4})\\=21-18+\frac{1}{4} -\frac{2}{4} \\=3-\frac{1}{4} \\=\frac{12-1}{4} \\=\frac{11}{4} \\=2\frac{3}{4} \\or\\21\frac{1}{4} -18\frac{2}{4} \\=\frac{85}{4} -\frac{74}{4} \\=\frac{85-74}{4} \\=\frac{11}{4} \\=2\frac{3}{4}

3 0
3 years ago
This recipe calls for 12 cinnamon rolls but I need 30 what number do I multiply
Paha777 [63]

Answer:

12 x 2.5 = 30

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
Please help me solve the screenshot below.
Harrizon [31]

Answer:

The arrangement of the given equation in the slope - intercept form are

  1. y=-x+4
  2. y=2x-5

Step-by-step explanation:

Given:

x + y = 4 and

y - 2x = -5

Slope - intercept form :

y=mx+c

Where,

m is the slope of the line.

c is the y-intercept.

When two points are given say ( x1 , y1 )  and ( x2 , y2)  we can remove slope by

Slope,

m=\frac{y_{2}- y_{1}}{x_{2}- x_{1}}

Intercepts: Where the line cut X axis called X- intercept and where cut Y axis is called Y- intercept.

So, the Slope -intercept form of

x + y = 4   is  y=-x+4

and

y - 2x = -5 is  y=2x-5

3 0
3 years ago
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