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Gala2k [10]
4 years ago
8

72 is equal to 80% of a number n. Write and solve and equation to find n. Write the percent as a decimal.

Mathematics
1 answer:
Deffense [45]4 years ago
4 0
I'm pretty sure the answer is 90 = n decimal 0.8
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Suppose you work in the quality assurance department of a chemical processing plant and it is your responsibility to ascertain w
aleksandrvk [35]

Answer:

48.668 ≤ μ ≤ 63.332

Step-by-step explanation:

Given the data:

Sample (X) : 71, 45, 54, 75, 50, 49, 63, 55, 48, 50

Number of samples (n) = 10

α = 95% = 0.05

Determine the range within which the true mean of the fluid samples from the day shift will be with a 95% confidence

True mean = μ

Confidence interval :

m ± t(α/2 ; df) * s/√n

m - t(α/2 ; df) * s/√n ≤ μ ≤ m + t(α/2 ; df) * s/√n

m = sample mean ; s = sample standard deviation ; df = degree of freedom =(n - 1) = (10 - 1) = 9

Calculating the sample mean and standard deviation using calculator to save computation time :

71, 45, 54, 75, 50, 49, 63, 55, 48, 50

m = 56 ; s = 10.25

m - t(0.05/2 ; 9) * s/√n ≤ μ ≤ m + t(0.05/2 ; df) * s/√n

From t table : t(0.05/2 ; 9) = t(0.025, 9) = 2.262

56-2.262 * (10.25/√10) ≤ μ ≤ 56+2.262 * (10.25/√10)

48.668 ≤ μ ≤ 63.332

6 0
3 years ago
The height of a volleyball, h, in feet, is given by h = −16t2 + 11t + 5.5, where t is the number of seconds after it has been hi
slavikrds [6]

Answer:

It will travel high enough

Step-by-step explanation:

Find the vertex of the parabola:

x=-b/2a

x=-11/2(-16)

x=-11/-32

x=11/32

Plug x=11/32 into quadratic to get the y-coordinate:

h=-16(11/32)^2+11(11/32)+5.5

h=7.391

Since 7.391>7.3, the volleyball will travel high enough (aka. yes)

3 0
3 years ago
Negative 3 over 4 times negative 12
Ludmilka [50]

Answer:

9

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
A dance school has 63 ballet dancers a 42% of the total number of dancers in the score ballet dancers what is the total number o
melamori03 [73]
42% of what is 63

0.42x = 63
x = 63/0.42
x = 150

There are 150 dancers in the school
3 0
3 years ago
Pleaseee helpppp!!!!! I keep getting this answer wrong on the test :(
zaharov [31]
Next time study more! I know its hard but you can do it keep trying ur best :)
5 0
3 years ago
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