-Pencils were first used in 1662.
-Graphite is a crystalline form of the element carbon with its atoms arranged in a hexagonal structure.
- HB is a graphite hardness/grading scale: the higher the number next to H, the harder and lighter/less dark the pencil lead is.
- The H stands for “hard.”
95.44% IQ scores are between 77 and 125
We're given,
Mean (a)=101
standard deviation (b)=12
To find : ![P[77 < x < 125]](https://tex.z-dn.net/?f=P%5B77%20%3C%20x%20%3C%20125%5D)
Using Empirical Rule:
∴ 
![P[\frac{77-101}{12} < \frac{x-a}{b} < \frac{125-101}{12}]\\](https://tex.z-dn.net/?f=P%5B%5Cfrac%7B77-101%7D%7B12%7D%20%3C%20%5Cfrac%7Bx-a%7D%7Bb%7D%20%3C%20%5Cfrac%7B125-101%7D%7B12%7D%5D%5C%5C)
![=P[-2 < z < 2]\\](https://tex.z-dn.net/?f=%3DP%5B-2%20%3C%20z%20%3C%202%5D%5C%5C)
![=P[Z < 2]-P[Z < -2]\\](https://tex.z-dn.net/?f=%3DP%5BZ%20%3C%202%5D-P%5BZ%20%3C%20-2%5D%5C%5C)
=95.44% (approx)
Learn more about Empirical rule of IQ calculation here:
brainly.com/question/13077017
#SPJ10
I believe when studying, you should read and study as much information as you can, textbooks, Notes, research, ETC. Studying is for you to put everything you have learned into one.
~Hope This Helped~
0.60 × collection = 27 cars
collection = 27 cars / 0.60 . . . . divide by the coefficient of the variable
collection = 45 cars
Samuel has 45 cars in his collection.
The option that are indicators of heatstroke are:
- high temperature above 104F.
- Layer of red skin that can be either dry or moist.
- Throbbing headache.
- Dizziness, vomiting.
- Seizures.
<h3>What is Heat stoke?</h3>
This is known to be a kind of a life-threatening condition that is said to often occurs if a person ignore the warning signs of heat exhaustion or do when a person do not act quickly enough to get care.
Hence, The option that are indicators of heatstroke are:
- high temperature above 104F.
- Layer of red skin that can be either dry or moist.
- Throbbing headache.
- Dizziness, vomiting.
- Seizures.
Learn more about heatstroke from
brainly.com/question/27934003
#SPJ1
