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nexus9112 [7]
3 years ago
8

Please help. im not good with probability

Mathematics
1 answer:
qaws [65]3 years ago
8 0
2 out of 10 chances

2/10 is 1/5
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n an after school program, students must choose to either play on the playground or read a book silently. On one cloudy day, 70%
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20% b/c
70% playground - 60% boys= 10%girls
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3 years ago
Explain in your own words what the mean of a negative exponent means?
BlackZzzverrR [31]
A negative exponent is the opposite of a regular exponent so for example, 5 to the power of -3 is 1/125 
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3 years ago
What is the solution to the equation fraction 4 over 5 n minus fraction 1 over 5 equals fraction 2 over 5 n?
photoshop1234 [79]

Answer:

value of n = 2

Step-by-step explanation:

\frac{4}{5n}-\frac{1}{5}=\frac{2}{5n}

We need to solve the above equation.

Find Least Common multiplier from 5n, 5 = 5n

Multiply both sides of the equation by 5n

\frac{4}{5n}*5n-\frac{1}{5}*5n=\frac{2}{5n}*5n\\Solving:\\4 -n = 2\\

Now finding the value of n.

Adding -4 on both sides

4 -n-4 = 2-4\\-n= -2

Multiplying both sides by -1

n = 2

The value of n is 2.

We can verify by putting value of n in the given question.

\frac{4}{5n}-\frac{1}{5}=\frac{2}{5n}\\n=2\\\frac{4}{5*2}-\frac{1}{5}=\frac{2}{5*2}\\\frac{4}{10}-\frac{1}{5}=\frac{2}{10}\\\frac{2}{5}-\frac{1}{5}=\frac{1}{5}\\\frac{2-1}{5}=\frac{1}{5}\\\frac{1}{5}=\frac{1}{5}

So, value of n = 2

5 0
3 years ago
31) Find the area of a sector of a circle with a
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Answer C 52.3 cm2

Step-by-step explanation:

I say this because When using the A=r2 x a / 2 you plug in the numbers and het the sector area.

3 0
3 years ago
A sociologist develops a test to measure attitudes towards public transportation, and 25 randomly selected subjects are given th
zhannawk [14.2K]

Answer:

The 95% confidence interval for the mean score of all such subjects is (32.033, 120.367).

Step-by-step explanation:

We have the sample standard deviation, so we use the t-distribution to solve this question.

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 25 - 1 = 24

95% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 24 degrees of freedom(y-axis) and a confidence level of 1 - \frac{1 - 0.95}{2} = 0.975. So we have T = 2.039

The margin of error is:

M = T*s = 2.0639*21.4 = 44.167

In which s is the standard deviation of the sample.

The lower end of the interval is the sample mean subtracted by M. So it is 76.2 - 44.167 = 32.033

The upper end of the interval is the sample mean added to M. So it is 76.2 + 44.167 = 120.367

The 95% confidence interval for the mean score of all such subjects is (32.033, 120.367).

7 0
3 years ago
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