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gladu [14]
3 years ago
10

Please help me with this????

Mathematics
1 answer:
Alex3 years ago
7 0

Answer:

x >= 95

3(x+5) > or equal to 300

Step-by-step explanation:

3x +15 >= 300

3x >= 300-15

x >= 95

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zalisa [80]

The confidence interval formula is computed by:

Xbar ± Z s/ sqrt (n)

Where:

Xbar is the mean

Z is the z value

S is the standard deviation

N is the number of samples

 

So our given are:

90% confidence interval with a z value of 1.645

Sample size 40, 45

Mean 180, 179

Standard deviation 2, 4

 

So plugging that information in the data will give us a confidence interval:

For 1:

Xbar ± Z s/ sqrt (n)

= 180 ± 1.645 (2 / sqrt (40))

= 180 ± 1.645 (0.316227766)

= 180 ± 0.520194675

= 179.48, 180.52

For 2:

Xbar ± Z s/ sqrt (n)

= 179 ± 1.645 (4 / sqrt (45))

<span>= 179 ± 1.645 (0.596284794)</span>

therefore, the answer is letter b

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3 years ago
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Harry needs to build a fence around his garden, but first he must figure out the dimensions of his garden. The length of his rec
Lana71 [14]
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6 0
3 years ago
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Paladinen [302]
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