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Kay [80]
3 years ago
12

Please help me out :D

Mathematics
1 answer:
Readme [11.4K]3 years ago
4 0
Lol k12 kids...... its D 216

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In a bag are 3 red, 9 blue, 2 yellow and 3 green marbles. If you draw out a marble at random, what the probability that you will
dmitriy555 [2]

Answer:

9/17

Step-by-step explanation:

there are 17 marbles in total 9 of them are blue therefore, 9/17 is the correct answer

6 0
3 years ago
The number of hours worked per year per person in a state is normally distributed with a standard deviation of 39. A sample of 1
evablogger [386]

Answer:

The 98% confidence interval for the population mean number of hours worked per year per person is (2146, 2193).

Step-by-step explanation:

The question is incomplete.

The number of hours registered in the sample are:

2051 2061 2162 2167 2169 2171

2180 2183 2186 2195 2196 2198

2205 2210 2211

The sample mean can be calculated as:

M=\dfrac{1}{n}\sum_{i=1}^n\,x_i\\\\\\M=\dfrac{1}{15}(2051+2061+2162+2167+2169+2171+2180+2183+2186+2195+2196+2198+2205+2210+2211)\\\\\\M=\dfrac{32545}{15}\\\\\\M=2169.67\\\\\\

We have to calculate a 98% confidence interval for the mean.

The population standard deviation is know and is σ=39.

The sample mean is M=2169.67.

The sample size is N=15.

As σ is known, the standard error of the mean (σM) is calculated as:

\sigma_M=\dfrac{\sigma}{\sqrt{N}}=\dfrac{39}{\sqrt{15}}=\dfrac{39}{3.873}=10.07

The z-value for a 98% confidence interval is z=2.326.

The margin of error (MOE) can be calculated as:

MOE=z\cdot \sigma_M=2.326 \cdot 10.07=23.43

Then, the lower and upper bounds of the confidence interval are:

LL=M-t \cdot s_M = 2169.67-23.43=2146\\\\UL=M+t \cdot s_M = 2169.67+23.43=2193

The 98% confidence interval for the population mean is (2146, 2193).

3 0
3 years ago
I need to figure out what the value of “x” is I’ve been stuck on this problem for forever now.
Alexus [3.1K]

Answer:

x=5

Step-by-step explanation:

I just rounded up my answer but if this is not correct then it is a decimal of 4.7

7 0
3 years ago
there are thirty-three students in the chess club. there are five more boys than girls in the club. write and solve a system of
bixtya [17]
Girls=g
boys=g+5

33=g+(g+5)
33=g+g+5
33=2g+5
28=2g
14=g
g=14
4 0
3 years ago
Help me please asap lol!!
koban [17]

Answer:

The slope is 3/2

Step-by-step explanation:

(3,0) & (1,-3)

m=y²-y¹/x²-x¹

m=(-3)-0/1-3

m=-3/-2

m=3/2

8 0
2 years ago
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