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3 years ago

5

If I get 27 questions correct and the percent is 90 how many questions are there?

1 answer:

Mamont248 [21]3 years ago

6 0

27 is 90% of 30. Hope that helps.

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A music industry researcher wants to estimate, with a 90% confidence level, the proportion of young urban people (ages 21 to 35

Maslowich

Answer:

1,539

Step-by-step explanation:

Using Simple Random Sampling in an infinite population (this is such a large population that we do not know the exact number) we have that the sample size should be the nearest integer to

$\large \frac{Z^2pq}{e^2}$

where

<em>Z= the z-score corresponding to the confidence level, in this case 90%, so Z=1.645 (this means that the area under the Normal N(0,1) between [-1.645,1.645] is 90%=0.9) </em>

<em>p= the proportion of young urban people (ages 21 to 35 years) who go to at least 3 concerts a year= 35% = 0.35 </em>

<em>q = 1-p = 0.65 </em>

<em>e = the error proportion = 2% = 0.02 </em>

Making the calculations

$\large \frac{Z^2pq}{e^2}=\frac{(1.645)^2*0.35*0.65}{(0.02)^2}=1,539.09$

So, the sample size should be 1,539 young urban people (ages 21 to 35 years)

6 0

3 years ago

Accrotime is a manufacturer of quartz crystal watches. Accrotime researchers have shown that the watches have an average life of

kirza4 [7]

Answer:

a

$P(X < 24 )= 21.186\%$

b

$x = 19.78 \ months$

Step-by-step explanation:

From the question we are told that

The mean is $\mu = 26 \ months$

The standard deviation is $\sigma = 4 \ months$

Generally 2 year is equal to 24 months

Generally the percentage of total production will the company expect to replace is mathematically represented as

$P(X < 24 )= P(\frac{X - \mu }{ \sigma} < \frac{24 - 26}{4} )$

Generally $\frac{X - \mu}{\sigma } =Z (The \ standardized \ value \ of \ X )$

$P(X < 24 )= P(Z < -0.8 )$

Generally from the z-table

$P(Z < -0.8) = 0.21186$

So

$P(X < 24 )= 0.21186$

Converting to percentage

$P(X < 24 )= 0.21186 * 100$

=> $P(X < 24 )= 21.186\%$

Generally the duration that should be the guarantee period if Accrotime does not want to make refunds on more than 6% is mathematically evaluated as

$P(X < x) = P(\frac{X - \mu }{\sigma} < \frac{x - 26}{4} )= 0.06$

=> $P(X < x) = P(Z < \frac{x - 26}{4} )= 0.06$

From the normal distribution table the z-score for 0.06 at the lower tail is

$z = -1.555$

So

$\frac{x - 26}{4} = -1.555$

=> $x = 19.78 \ months$

7 0

3 years ago

Rewrite 0.169 in expanded form using powers of ten. A) (1×103) + (6×102) + (9×101) B) (1×101) + (6×102) + (9×103) C) (1×10-1) +

lubasha [3.4K]

That would be C....(1 x 10^-1) + (6 x 10^-2) + (9 x 10^-3)

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3 years ago

What is the slope and y-intercept of the following equation:<br> = 13 − 4 (show your work pls)

Colt1911 [192]

Answer:

Slope is 1/3

Y intercept is -4

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3 years ago

Mrs. Appleton baked 24

NISA [10]

Answer:

each child got 4 cookies with 4 left over

PLS MRK BRAINLIEST!!

Step-by-step explanation:

8 0

3 years ago

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