Let Z be a random variable following the standard normal distribution with mean µ = 0 and standard deviation σ = 1.
The 67th percentile of the distribution is the value z that separates the bottom 67% of the distribution from the top 100% - 67% = 33%. In terms of probability, we have
Pr[Z ≤ z] = 0.67
Use the inverse CDF for the normal distribution (or lookup z scores in a table) to find
z = ɸ⁻¹(0.67) ≈ 0.4399
where ɸ(z) is the CDF for the normal distribution.
There are several types of keboard designs and research is ongoing to improve their efficiency e,g QWERTY, QWERTZ and AZERTY keyboards
<h3>Types of Keyboards</h3>
Bellow is an extended list of the various types of keyboards
- Qwerty Keyboards
- Wired Keyboards
- Numeric Keypads
- Ergonomic Keyboards
- Wireless Keyboards
- USB Keyboards
- Bluetooth Keyboards
Learn more about the types of keyboards here:
brainly.com/question/13380788
Answer:
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