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AlexFokin [52]
3 years ago
14

Wich epression has a value of 2/3

Mathematics
1 answer:
valina [46]3 years ago
8 0

Answer:

which expressions are we choosing from?

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The mean time it takes to walk to the bus stop is 8 minutes (with a standard deviation of 2 minutes) and the mean time it takes
kifflom [539]

We have been given for a normal distribution the mean time it takes to walk to the bus stop is 8 minutes with a standard deviation of 2 minutes. And the mean time it takes for the bus to get to school is 20 minutes with a standard deviation of 4 minutes.

(a) Average time that it would take reach school can be obtained by adding the average times.

8+20 = 28 minutes.

(b) Standard deviation of the trip to school can be found as:

\sigma =\sqrt{2^{2}+4^{2}}=\sqrt{4+16}=\sqrt{20}=4.47

Therefore, standard deviation of the entire trip is 4.47 minutes.

(c) Let us first find z score corresponding to 30 minutes.z=\frac{x-\mu }{\sigma }=\frac{30-28}{4.47}=0.447

We need to find the probability such that P(x>30)=P(z>0.447)=0.67

Therefore, the required probability is 0.67.

(d) If average time to walk to school is 10 minutes, then overall average time for the trip will be 10+20 = 30 minutes.

(e) Standard deviation won't change it will remain 4.47

(f) The new probability will be:

z=\frac{x-\mu }{\sigma }=\frac{30-90}{4.47}=0

P(x>30)=P(z>0)=0.5

Therefore, probability will be 0.50.


6 0
3 years ago
Read 2 more answers
PLEASE HELP ME OUT I NEED IT !!
lisov135 [29]

Answer:

(1/2 ,3) or (0.5, 3) is the same

Step-by-step explanation:

The midpoint between (3,5) and (-2,1) would be:

Apply the formula:

x1+x2 / 2 , y1 + y2 / 2

= 3 + (-2) / 2, 5 + 1 /2

= 1/2, 6/2

= 1/2 ,3 or 0.5, 3 is the same

Hope this helped :3

4 0
3 years ago
Graph y=-2x. give the domain and range. is the function dicrete or continou?
r-ruslan [8.4K]

Answer:

Domain: (−∞,∞),{x|x∈R}

Range: (−∞,∞),{y|y∈R}

Step-by-step explanation:

Find the domain by finding where the function is defined. The range is the set of values that correspond with the domain.

Domain: (−∞,∞),{x|x∈R}

Range: (−∞,∞),{y|y∈R}

6 0
2 years ago
PLEASE Help...
Alex787 [66]
Like in money?Is there a specific amount?. or anything more to what I would have?I need more details
4 0
3 years ago
I don’t know how to explain on why the student was incorrect
Zolol [24]

Answer:

the constant proportionality means the ratio between two directly proportional quantities.

so the constant proportionality will be 7.5÷6=1.25 or 10÷8=1.25 or 12.5÷10=1.25

constant proportionality should be same all through because it's a constant

7 0
3 years ago
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