50 is what percent of 80

2 answers:

8 0

50 = x% * 80

50 = x/100 * 80

50 = x/10 * 8

Multiply 10 on both sides.

500 = x * 8

8x = 500

Divide 8 on both sides.

x = 500/8

x = 62.5

50 is 62.5 percent of 80.

Nuetrik [128]3 years ago

6 0

50 is 62.5% of 80

Divide 50 by 80 to get the decimal:
$\frac{50}{80} = 0.625$

Multiply the decimal by 100:
$0.625 \times 100 = 62.5$

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The amount of time a certain brand of light bulb lasts is normally distribued with a mean of 1800 hours and a standard deviation

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Answer: 68% of light bulbs last between 1765 hours and 1835 hours.

Step-by-step explanation:

The empirical rule states that for a normal distribution, nearly all of the data will fall within three standard deviations of the mean . The empirical rule is further illustrated below

68% of data falls within the first standard deviation from the mean.

95% fall within two standard deviations.

99.7% fall within three standard deviations.

From the information given, the mean is 1800 hours and the standard deviation is 35 hours.

1 standard deviation = 1 × 35 = 35

1800 - 35 = 1765 hours

1800 + 35 = 1835 hours

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