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Greeley [361]
1 year ago
15

In a given survey, 9 people said their favorite color is pink. This number represented 45% of the total people. How many total p

eople took the survey?
Mathematics
2 answers:
Anni [7]1 year ago
6 0
The answer is 20 !!!!
levacccp [35]1 year ago
5 0
20 because if 9 is 45% than 1 person is equal to 5%. and if you added one more person to make 10 it would be half which is 50%. so 10+10=20 which = 100%
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1 year ago
The weights of certain machine components are normally distributed with a mean of 8.01 g and a standard deviation of 0.06 g. Fin
Free_Kalibri [48]

Answer:

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Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 8.01 g

Standard Deviation, σ = 0.06 g

We are given that the distribution of weights is a bell shaped distribution that is a normal distribution.

Formula:

z_{score} = \displaystyle\frac{x-\mu}{\sigma}

We have to find the value of x such that the probability is 0.03

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= 1 -P( z \leq \displaystyle\frac{x - 8.01}{0.06})=0.03  

=P( z \leq \displaystyle\frac{x - 8.01}{0.06})=0.97  

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P(X < x)  

P( X < x) = P( z < \displaystyle\frac{x - 8.01}{0.06})=0.03  

Calculation the value from standard normal z table, we have,  

\displaystyle\frac{x - 8.01}{0.06} = -1.881\\\\x = 7.90  

Thus, 7.90 separates the bottom 3% of the weights.

Thus, the correct answer is

Option D) 7.90 g and 8.12 g

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