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PSYCHO15rus [73]
3 years ago
13

Customers are considered very satisfied with the XYZ Box video game system if the mean of the population of all satisfaction rat

ings is higher than 50. Assume that the standard deviation of the population of all satisfaction ratings is 4.64.
a. If the population mean of all satisfaction ratings is 50, what is the probability of observing a random sample of 80 satisfaction ratings with a mean greater than or equal to 51.45?

b. We have actually observed a random sample of 80 satisfaction ratings with a mean of 51.45. What do you conclude about whether customers are very satisfied with the XYZ Box video game system?
Mathematics
1 answer:
yKpoI14uk [10]3 years ago
3 0
It is C not( A,B.D ok be home by
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The answer to is 15 because your trying to make all of the angles add up to 90, which 45+30= 75 so then you only need 15 more to add up to 90.
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Multiply. (3.5x10^-5) (3x10^-10) express your answer in scientific notation.​
Len [333]

Answer:

5.69034 × 1011

Step-by-step explanation:

Decimal  

1234000000

Scientific Notation  

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×10^  

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×10^  

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3 years ago
Calculate the future value of $51,123.21, earning interest at a rate of that is compounded daily for 20 years and 2 months (use
mina [271]

The compound interest formula is : A = P(1+ \frac{r}{n})^n ^t

where, A= Future value including the interest,

P= Principle amount, r= rate of interest in decimal form,

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Here, in this problem P= $ 51,123.21 , t= 20 years and 2 months

So, t= 20 + (2/12) years

t= 20 + 0.17 = 20.17 years

As the amount is compounded daily, so n= (12×30)= 360 [Using the traditional Banker’s rule of 30 days per month]

Thus, A = 51,123.21( 1+ \frac{r}{360})^3^6^0^*^2^0^.^1^7

A= 51,123.21 (1+\frac{r}{360})^7^2^6^1^.^2

When the interest rate is given, then we can use this equation for finding the future value.

3 0
3 years ago
Which graph shows a line with positive slope that passes through the point (r, s)?
Nadusha1986 [10]

r is the x coordinate and s is the y coordinate. Positive slopes go from lower left to upper right, like going up stairs or up a hill. The line that goes through (r, s) that is positive is line B.

5 0
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what is 2 + 2 no one in my class can get it my teacher says its the hardest question I want to look smart please help
BlackZzzverrR [31]

Answer:

4

Step-by-step explanation:

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3 years ago
Read 2 more answers
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