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4 years ago

8. Karyn proofreads 15 pages in 2 hours for $40.

1 answer:

7 0

Hi , Karyn proofreads 5 pages per hour , basically two half hours are equal to 10 pages , then 1 hour equals 5 pages . She will receive 16 dollars for one page , because she receives 20 dollars for 5 pages . The unit rate is 5 pages per hour.

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Four friends own a car wash. The total profit in the first month was $438 $ 438 . In two months, each of the friends had made a

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4 years ago

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P L E A S E HELP FAST 30 POINTS

kramer

The answer to the question is b

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3 years ago

Suppose the national mean annual salary for a school administrator is $91,000 a year. A school official took a sample of 25 scho

Gemiola [76]

Answer:

H0 : μ = 91000

H1 : μ ≠ 91000

Test statistic = - 2.594

Pvalue = 0.016

|Tcritical | = 2.064

Reject H0. We can conclude that the mean annual administrator salary in Ohio differs significantly from the national mean annual salary.

Step-by-step explanation:

The hypothesis :

H0 : μ = 91000

H1 : μ ≠ 91000

From the data given :

77600 76000 90700 97200 90700

101800 78700 81300 84200 97600

77500 75700 89400 84300 78700

84600 87700 103400 83800 101300

94700 69200 95400 61500 68800

Using calculator :

Sample mean, xbar = 85272

Sample standard deviation, s = 11039.23

Sample size, n = 25

The test statistic :

(xbar - μ) ÷ (s/√(n))

(85272 - 91000) / (11039.23/√(25)

Test statistic = - 5728 / 2207.846

Test statistic = - 2.594

The Pvalue : df = n - 1 = 25 - 1 = 24

Pvalue(-2.594, 24) = 0.0159

Decision region :

Reject H0 ; If Pvalue < α ;

α = 0.05

Using the critical value :

Decision region :

Reject H0 ; If Test statistic > |Tcritical;

Tcritical value at df = 24 ; α = 0.05 ;

|Tcritical | = 2.064

Hence,

We Reject H0 ; Since, |Test statistic| > |Tcritical|and conclude that mean salary depends differs

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3 years ago

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soldier1979 [14.2K]

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4 years ago

Write the formula for the n th term of the arithmetic sequence 4,6,8,10. Use the formula to find a8

Alina [70]

Answer:

an = 4 + 2(n-1)
a8 = 18

Step-by-step explanation:

The n-th term is given by ...

an = a1 + d(n -1)

for common difference d and first term a1.

You have a sequence with a first term 4 and a common difference of 6-4=2, so the formula is ...

an = 4 + 2(n -1)

Using n=8, we find ...

a8 = 4 + 2(8-1)

a8 = 18

3 0

4 years ago

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