20*(26+3.15*4) = ?
20*(26+12.6) = ?
20*(38.6) = 772
She had $772 in her Twitter portfolio after 4 hours
The answer is D. Ratio. When ever you see “per” another number it’s a ratio.
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.
-5,4 would be in the quadrant 1<span />
Answer:

Step-by-step explanation: