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Tems11 [23]
3 years ago
14

The gestation time for humans has a mean of 266 days and a standard deviation of 25 days. If 200 women are randomly selected, fi

nd the probability that they have a mean pregnancy between 266 days and 268 days.

Biology
1 answer:
Yuki888 [10]3 years ago
8 0

Answer:

The probability that 200 women have a mean pregnancy between 266 days and 268 days is 0.371.

Explanation:

Let <em>X</em> = gestation time for humans.

The mean of the random variable <em>X</em> is: E (X) = <em>μ</em> = 266 days.

The standard deviation of the random variable <em>X</em> is: SD (X) = <em>σ</em> = 25 days.

**Assume that the gestation time for humans follows a Normal distribution.

The <em>z</em>-score for the sample mean is: z=\frac{\bar x-\mu}{\sigma/ \sqrt{n}}.

The sample of women selected is:<em> </em><em>n</em> = 200.

Compute the probability that 200 women have a mean pregnancy between 266 days and 268 days as follows:

P(266\leq \bar X\leq \leq 268)=P(\frac{266-266}{25/ \sqrt{200}}\leq \frac{\bar X-\mu}{\sigma/ \sqrt{n}}\leq \frac{268-266}{25/ \sqrt{200}})\\=P(0\leq Z\leq 1.13)\\=P(Z

**Use the <em>z</em>-table for the probability.

Thus, the probability that 200 women have a mean pregnancy between 266 days and 268 days is 0.371.

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A heterozygous tall pea plant is allowed to self-fertilize. The resulting F1 progeny are 25% homozygous tall, 50% heterozygous t
maks197457 [2]

Answer:

25% heterozygous tall

Explanation:

If we take the F1 generation as parents and let them self-fertilise, we have 4 crosses.

The first one for homozygous tall, then we have 100% AA.

The second and third one for heterozygous tall and we have 25% AA, 50%Aa and 25%aa for each of them.

The last one would be for dwarf, and we'll have 100%aa.

Adding all of them, we'll have

AA = 100 + 25 + 25 = 150%

Aa =  50+50 = 100%

aa = 100 + 25 + 25 = 150%

as we had 4 crosses, so dividing the total percentages by 4, we'll have,

AA = 37.5%

Aa = 25%

aa = 37.5%

:. The percentage of heterozygous tall would be 25%.

Hope it helps:)

8 0
3 years ago
Which part of carol's nervous system gave her the strength to knock out the man's breath and run home faster than the wind?
mr Goodwill [35]
The nervous system is divided into several parts, and in this case, the answer is Sympathetic Nervous System.
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4 0
3 years ago
1) <br> Tides are caused by<br> A) gravity. <br> B) heat. <br> C) waves. <br> D) winds.
Ulleksa [173]

Answer:

Gravity

Explanation:

Tides are caused by gravity

8 0
3 years ago
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If you count 52 purple rough corn kernels and 50 yellow smooth corn kernels how many people smooth corn kernels should you expec
Vitek1552 [10]

Answer:

17

Explanation:

In corn,

Smooth kernel (S) is dominant to rough kernel (s)

Purple kernel (P) is dominant to yellow kernel (p)

Since no information has been given about the cross here let us assume it to be a standard dihybrid cross.

The phenotypic ratio of dihybrid cross is 9:3:3:1. 9/16 will show dominant phenotype for both traits, 3/16 will show dominant phenotype for one trait, other 3/16 will show dominant phenotype for the second trait, 1/16 will have recessive phenotype for both the traits.

Here,

Purple rough (P_ss) = 52

Yellow smooth (ppS_) = 50

Both of them show dominant phenotype for one trait so they each form 3/16 of the progeny.

If the total progeny was z, 3/16*z = 50

z = (50*16)/3 = 267

Total progeny = 267 kernels

Yellow rough kernels (ppss) = (1/16*267) = 17

So approximately 17 corn kernels will be yellow and rough.

8 0
3 years ago
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The answer is false

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