Please help The batteries from a certain manufacturer have
distributed, complete the following statements.
mean lifetime of 810 hours, with a standard deviation of 90 hours. Assuming that the lifetimes are normally
(a) Approximately
V of the batteries have lifetimes between 540 hours and
1080 hours
(b) Approximately 68% of the batteries have lifetimes between hours and
LO hours
5
2

step-by-step explanation:

1. practice, practice & more practice

2. review errors

3. master the key concepts

do not try to memorise the processes.

4. understand your doubts.

5. create a distraction free study environment

6. create a mathematical dictionary

7. apply maths to real world problems.

answer: 140

step-by-step explanation:

so just add all then it will be your answer but i am not pretty sur eif it is but hope this i am here to people

here is the

mark brainliest pl

2/3x + 7 = 29

step-by-step explanation:

two thirds = 2/3

plus a number = x

at least 29 = 29

there for you should get 2/3x + 7 = 29