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olga nikolaevna [1]
3 years ago
11

A drilling machine can drill 12 holes in 6 minutes.If the machine drill holes at a constant speed, it can drill holes in 25 minu

tes
Mathematics
1 answer:
Zielflug [23.3K]3 years ago
7 0

Answer:

Did you mean to ask how many holes can the drill drill in 25 minutes, then the answer is 50

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The average score on a standardized test is 750 points with a standard deviation of 50 points. What is the probability that a st
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The probability that student scored more than 850 we shall proceed as follows:
z=(x-μ)/σ
where:
x=850
μ=750
σ=50
thus
z=(850-750)/50
z=2
thus
P(x>850)=1-P(x<850)=1-P(z<2)=1-0.9772=0.0228

Answer: P(x>850)=0.0228
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3 years ago
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Some electronic devices are better used than new: the failure rate is higher when they are new than when they are six months old
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Given that half of the personal music players sold by a particular brand have a flaw. If the player has the​ flaw, it dies in the first six months. If it does not have this​ flaw, then only 20​% fail in the first six months.
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2 years ago
What I the slope of each line? Y=1/2 x - 4<br> y= 2x -3
inessss [21]

Answer:

1/2

2

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y = 1/2x - 4 (the slope for this line is 1/2)

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4 0
2 years ago
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Two communication mask 2km apart and directly north and south of each other. Ubi 's home is 500 m from one and directly east. Ho
pochemuha

Answer: 2061.55\ m

Step-by-step explanation:

Given

The two communication mask are 2 km apart

Ubi's home is 500 m east of one of the mask

Suppose its distance from the other's is x

From the figure, we can write

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2 years ago
What set of fractions equals 1 1/2?
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Answer:

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