In July 15 days of rain, 10 days without rain, 6 days of only sunshine. What fraction of the days in July did not have any rain?

2 answers:

8 0

16/31 days
bc there are 31 days in a month correct?
so therefore if it rained 15 days and didn’t rain 10 days and was sunny 6 days 10+6 equals 16 and 16+15 equals 31

KonstantinChe [14]4 years ago

5 0

Answer:

16/31 days

Step-by-step explanation:

Add up all the days: 15+10+6=31

Add up the days with no rain: 10+6=16

With no rain as numerator and total as denominator you get an answer of 16/31

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Suppose that a jewelry store tracked the amount of emeralds they sold each week to more accurately estimate how many emeralds to

Marysya12 [62]

Answer:

The mean is 2.75.

The margin of error is 0.62.

Step-by-step explanation:

In this case, we know the 95% confidence interval, and we want to know the mean and the margin of error.

The mean can be calculated as the average between the upper limit and lower limit:

$\mu=\frac{UL-LL}{2}=\frac{3.37+2.13}{2}=\frac{5.5}{2}=2.75$

The margin of error is the difference between the upper (or lower limit) and the mean. It equals the product between the z-value and the standard deviation divided by the square of the sample size.

It can also be calculated as half the difference of the limits of the confidence interval.

We only have the limits of the confidence interval to calculate the margin of error:

$ME=z\sigma/\sqrt{n}=\frac{UL-LL}{2}=\frac{3.37-2.13}{2}=\frac{1.24}{2}= 0.62$