Answer:
The answer is "8.74 and 36.46 years"
Step-by-step explanation:
Mean (life-time)=22.6 years
standard deviation= 3.1 years
We must find out how many standard deviations are 95% of the data.
Calculating the lower limit and upper limit:
![Lower\ limit = 22.6 - 4.47(3.1) = 22.6 - 13.86 = 8.74\\\\Upper\ limit = 22.6 + 4.47(3.1) = 22.6 + 13.86 = 36.46](https://tex.z-dn.net/?f=Lower%5C%20limit%20%3D%2022.6%20-%204.47%283.1%29%20%3D%2022.6%20-%2013.86%20%3D%208.74%5C%5C%5C%5CUpper%5C%20limit%20%3D%2022.6%20%2B%204.47%283.1%29%20%3D%2022.6%20%2B%2013.86%20%3D%2036.46)
Limit is 8.74 years to 36.46 years
Answer:
c
Step-by-step explanation:
Answer: 4-10i. The real part is 4, and the imaginary part is -10i.
Step-by-step explanation: Treat i as just a variable, and use simple algebra. By simplifying, it just turns out to be 5-1, and -2i-8i, thus leading to 4-10i.