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Oxana [17]
3 years ago
10

39/40 into a percent

Mathematics
1 answer:
motikmotik3 years ago
6 0

Answer:97.5%

Step-by-step explanation: you just divide both numbers to get your percent

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A simple random sample was taken of 44 water bottles from a bottling plant’s warehouse. The dissolved oxygen content (in mg/L) w
Margarita [4]

Answer:

(a) Test statistic is -2.85 and p-value is 0.0022

(b) Reject the null hypothesis. The population mean of dissolved oxygen content is not equal to 10 mg/L

Step-by-step explanation:

H0: mu equals 10

Ha: mu not equals 10

The test is a two-tailed test because the alternate hypothesis is expressed using not equal to

(a) Test statistic (z) = (sample mean - population mean) ÷ (sd/√n) = (9.14 - 10) ÷ (2/√44) = -0.86 ÷ 0.302 = -2.85

Cumulative area of the test statistic = 0.9978

p-value = 2(1 - 0.9978) = 2(0.0022) = 0.0044

(b) The critical value using 0.02 significance level is 2.422. For a two-tailed test, the region of no rejection of the test statistic lies between -2.422 and 2.422.

Conclusion:

Reject the null hypothesis because the test statistic -2.85 falls outside the region bounded by the critical values -2.422 and 2.422.

The population mean of dissolved oxygen content is not equal to 10 mg/L

7 0
3 years ago
The answer to this word problem usinf discriminant
solniwko [45]
\bf h=-9.8t^2+45t+1.2\implies 64.5=-9.8t^2+45t+1.2
\\\\\\
0=-9.8t^2+45t-63.3\\\\
-------------------------------

\bf \qquad \qquad \qquad \textit{discriminant of a quadratic}
\\\\\\
0=\stackrel{\stackrel{a}{\downarrow }}{-9.8}t^2\stackrel{\stackrel{b}{\downarrow }}{+45}t\stackrel{\stackrel{c}{\downarrow }}{-63.3}
~~~~~~
\stackrel{discriminant}{b^2-4ac}=
\begin{cases}
0&\textit{one solution}\\
positive&\textit{two solutions}\\
negative&\textit{no solution}
\end{cases}
\\\\\\
(45)^2-4(-9.8)(-63.3)\implies -456.36

the discriminant is a negative value, thus no solution for such quadratic, meaning if we use h=64.5 like we did, there's no "t" seconds at which point the ball hits the batting cage.
8 0
3 years ago
A store offers a 15% discount on all items in the store during a sale. All store employees get an additional 10% employee discou
vodomira [7]
The question tells us to find or to calculate how much would Chris pay for the coat during the sale. So to calculate the you must first analyze the formula that is given which is C=0.765+0.06(0.765x) while the variablec is the cost of an item and the X represents the price of the coat and the price of the coat on sale would be 81.09 
3 0
2 years ago
Simplify:<br><br> 3-2<br> what is this awnser
sweet [91]

Answer:

It is ................................................................. 1

Step-by-step explanation:

7 0
3 years ago
X+40+4x-5=6x+20 can I get some help with this problem please and thanks.
laila [671]

Answer:

the answer is c=−1/20x+7/4

Step-by-step explanation:

6 0
3 years ago
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