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Basile [38]
3 years ago
13

I need help and can u please show your work please and thank u

Mathematics
1 answer:
aivan3 [116]3 years ago
6 0

Answer:

Ur mom lol she gave birth to a kid who knows nothin

Step-by-step explanation:

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Babies born after 40 weeks gestation have a mean length of 52.2 centimeters (about 20.6 inches). Babies born one month early hav
Sveta_85 [38]

Answer:

a) Z = -2.88

b) Z = -0.96

c) 40 weeks gestation babies

Step-by-step explanation:

Normal Probability Distribution:

Problems of normal distributions can be solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the z-score of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X.

a. Find the standardized score (z-score), relative to all U.S. births, for a baby with a birth length of 45 cm.

Here, we use \mu = 52.2, \sigma = 2.5. So

Z = \frac{X - \mu}{\sigma}

Z = \frac{45 - 52.2}{2.5}

Z = -2.88

b. Find the standardized score of a birth length of 45 cm. for babies born one month early, using 47.4 as the mean.

Here, we use \mu = 47.4, \sigma = 2.5. So

Z = \frac{X - \mu}{\sigma}

Z = \frac{45 - 47.4}{2.5}

Z = -0.96

c. For which group is a birth length of 45 cm more common?

For each group, the probability is 1 subtracted by the pvalue of Z.

Z = -2.88 has a lower pvalue than Z = -0.96, so for Z = -2.88 the probability 1 - pvalue of Z will be greater. This means that for 40 weeks gestation babies a birth length of 45 cm is more common.

3 0
2 years ago
If x=25 when y=15, find x when y=24
mars1129 [50]

Answer:

\frac{24 \times 25}{15}  = 40

7 0
2 years ago
A recipe that serves 6 uses 1 1/4 cups of flour. How many cups are needed to serve 8?
pickupchik [31]

Answer:1 2/3

Step-by-step explanation:

6 uses 1 1/4. To improper fraction 6 uses 5/4. Thus 1 will use 5/4 ×1/6= 5/24. Then 8 will use 8×5/24=5/3=1 2/3

7 0
2 years ago
At a certain university, 42% of the students are women and 18% of the students are engineering majors. Of the engineers, 22% are
m_a_m_a [10]

Answer:

The probability that the selected person is a woman engineering major is 0.0396.

Step-by-step explanation:

The proportion of students at the university who are women is 0.42.

<em>P (W) = 0.42</em>

The proportion of students at the university who are engineering majors is 0.18.

<em>P (E) = 0.18</em>

The proportion of engineering majors that are women is 0.22.

<em>P (W|E) = 0.22</em>

The proportion of students at the university that are woman and engineering major is:

P (W|E)=\frac{P(W\cap E)}{P(E)} \\P(W\cap E)=P(W|E)\times P(E)\\= 0.18\times0.22\\=0.0396

Thus, the probability that the selected person is a woman engineering major is 0.0396.

7 0
3 years ago
Please answer all I'm so confused
Elena L [17]
Start, the first MAD is 2.5 go right, the second MAD is 3  MAD diagonal down, third is 6 go left. Fourth is MAD 9 straight down 2.8, Fifth diagonal up, 6th right  MAD 1.5 =Finish
7 0
3 years ago
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