Answer:
If the lifetime of batteries in the packet is 40.83 hours or more then, it exceeds for 5% of all packages.
Step-by-step explanation:
We are given the following information in the question:
Mean, μ = 15
Standard Deviation, σ = 1
Sample size = 4
Total lifetime of 4 batteries = 40 hours
We are given that the distribution of lifetime is a bell shaped distribution that is a normal distribution.
Formula:

Standard error due to sampling:

We have to find the value of x such that the probability is 0.05
P(X > x) = 0.05
Calculation the value from standard normal z table, we have,
Hence, if the lifetime of batteries in the packet is 40.83 hours or more then, it exceeds for 5% of all packages.
D)3x-2y=8
I added a picture explaining how I worked it out!
Answer:
I don't know this question what am I do for this question
It is 120 because first 8 goes into 96 which is 12. just add the 0 since u cant do anything else and it’s 120.
Answer:
4/7
Step-by-step explanation:
Multiply the number by The reciprocal of 1 2/5
4/5*5/7=20/35