Answer:
6
Step-by-step explanation:
I think its 6 times greater because the length was tripled and the width was doubled thus : 3 * 2 = 6
HOPE THIS HELPED
B point of origin is never seen
To find your answer in this problem you divide your miles and how many hours
1. 7
2.6
3. 7
4.8
We have been given that the average age of a breed of dog is 19.4 years. The distribution of their ages is normal and 20% of dogs are older than 22.8 years. We are asked to find the standard deviation.
Since 20% of dogs are older than 22.8 years, so 80% of dogs are younger than 22.8.
We will use z-score formula to solve our given problem.
, where,
z = z-score,
x = Random sample score,
= Mean,
= Standard deviation.
Now we will use normal distribution table to find the z-score corresponding to 80% or
.
z-score corresponding to 0.80 is 0.845.
Upon substituting our given values in z-score formula, we will get:
![0.845=\frac{22.8-19.4}{\sigma}](https://tex.z-dn.net/?f=0.845%3D%5Cfrac%7B22.8-19.4%7D%7B%5Csigma%7D)
![\sigma=\frac{22.8-19.4}{0.845}](https://tex.z-dn.net/?f=%5Csigma%3D%5Cfrac%7B22.8-19.4%7D%7B0.845%7D)
![\sigma=\frac{3.4}{0.845}](https://tex.z-dn.net/?f=%5Csigma%3D%5Cfrac%7B3.4%7D%7B0.845%7D)
![\sigma=4.0236](https://tex.z-dn.net/?f=%5Csigma%3D4.0236)
![\sigma\approx 4.02](https://tex.z-dn.net/?f=%5Csigma%5Capprox%204.02)
Therefore, the standard deviation is approximately 4.02 years.
Equation can be used to find x is 60/55 + 60+x = 2.75
The time of going to rink is 2.75
We know,
speed = distance/time
⇒ Time = distance / speed
<h3>How to solve?</h3>
(1) Way to rink
Given :
Distance = 60 miles
Speed = 55 miles per hours,
⇒ Time taken by him = Distance / speed = 60/55 hours
(2) Way to home
Given : Distance = 60 miles
Let Speed be x,
⇒ Time taken by him = distance/speed = 60/x hours
Total time taken = 60/55 + 60+x
According to Question, Total time = 2.75 hours,
Thus, 60/55 + 60+x = 2.75 is the required equation.
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