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Allisa [31]
3 years ago
15

The Rockwell hardness index for steel is determined by pressing a diamond point into the steel and measuring the depth of penetr

ation. For 50 specimens of an alloy of steel, the Rockwell hardness index averaged 62 with standard deviation 8. The manufacturer claims that this alloy has an average hardness index of at least 64. Is there sufficient evidence to refute the manufacturer’s claim at the 1% significance level?
Mathematics
1 answer:
Rudik [331]3 years ago
8 0
Does it say anything about carbon?
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Whats the answer to this problems
Airida [17]
Here's your answer to the first problem

7 0
3 years ago
Forty per cent of all those who applied for the job had experience. If 80 people had
Zielflug [23.3K]

Answer:

total people = X = 200

Step-by-step explanation:

total people = X = 200

People having experience = 80

Percent haing experience = 40 % = 40 / 100

40/ 100  x X = 80

x= 80  x 100 / 40 = 200

I hope im right!!

8 0
3 years ago
Write your answer in simplest radical form.​
pantera1 [17]

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Answer:

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6 0
3 years ago
Please help!!!!!!!!!!!​
topjm [15]

184.19 cm²

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4 0
3 years ago
Read 2 more answers
Cody is designing a pattern for a wood floor the length of the pieces of wood are 1 1/2 inches 1 13/16 inches and 2 1/8 inches w
erastovalidia [21]

Well, you only listed three pieces so far.  But I can already see a
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Of course, the next piece might return to 1-1/2 inches.  I mean,
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Cody would eventually wind up with pieces that are a mile long. 
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From the first piece to the second one, and from the second one
to the third one, the increase is  5/16 inch both times.  So if the
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1-1/2, then the next piece is

             (2-1/8 + 5/16) = (2-2/16 + 5/16)  =  2-7/16 inches .
8 0
3 years ago
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