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amid [387]
3 years ago
8

Plz help with all 4

Mathematics
1 answer:
fredd [130]3 years ago
5 0
1. 641
2. 65.4
3. 21+7=28 total marbles. The greatest number of groups would be 7, with 1 blue and 3 white.
4. 80% of 685= .80 x 685= 548 students.
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Suppose that 70% of college women have been on a diet within the past 12 months. A sample survey interviews an SRS of 267 colleg
Fofino [41]

Answer:

The probability that 75% or more of the women in the sample have been on a diet is 0.037.

Step-by-step explanation:

Let <em>X</em> = number of college women on a diet.

The probability of a woman being on diet is, P (X) = <em>p</em> = 0.70.

The sample of women selected is, <em>n</em> = 267.

The random variable thus follows a Binomial distribution with parameters <em>n</em> = 267 and <em>p</em> = 0.70.

As the sample size is large (n > 30), according to the Central limit theorem the sampling distribution of sample proportions (\hat p) follows a Normal distribution.  

The mean of this distribution is:

\mu_{\hat p} = p = 0.70

The standard deviation of this distribution is: \sigma_{\hat p}=\sqrt{\frac{p(1-p}{n}} =\sqrt{\frac{0.70(1-0.70}{267}}=0.028

Compute the probability that 75% or more of the women in the sample have been on a diet as follows:

P(\hat p \geq 0.75)=P(\frac{\hat p-\mu_{\hat p}}{\sigma_{\hat p}} \geq \frac{0.75-0.70}{0.028}) =P(Z\geq0.179)=1-P(Z

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

P(\hat p \geq 0.75)=1-P(Z

Thus, the probability that 75% or more of the women in the sample have been on a diet is 0.037.

7 0
2 years ago
I NEED HELP ASAP! WILL GIVE BRAINLEST!<br><br> Find the difference of 1/5 - (- 2 2/5)
m_a_m_a [10]

Answer:

2.6

Step-by-step explanation:

its the answer trust me

7 0
3 years ago
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What is 5/6 plus 7/8?
irina [24]

Answer:

1  17/24

Step-by-step explanation:

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3 years ago
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Use compatible numbers to estimate:4×26×7
Vlada [557]

4 times 25= 100 100 times 7= 700

mark brainliest plsss

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3 years ago
ILL GIVE BRAINLESTTTTTT
denpristay [2]

Answer:

Step-by-step explanation:

5/3 *2=10/6

10/6-6/6=4/6

7 0
3 years ago
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