A study has shown that 23 % of all college textbooks have a price of $ 95 or higher. It is known that the standard deviation of the prices of all college textbooks is $ 8.50 . Suppose the prices of all college textbooks have a normal distribution. What is the mean price of all college textbooks? Round your answer to the nearest integer. μ =

μ₀ = 89

Step-by-step explanation:

A study has shown that  23 %  of all College textbook cost 95 $ or more,  then if the area under the bell shape curve is 23 % in the right tail, then

z(score ) = 0,74          ( 0,23 ≈  0,2296  from z table )

Then z(score) = ( x - μ₀ ) / σ

0,74  =  ( 95 -  μ₀ ) / 8,5

0,74*8,5 = 95 -  μ₀

6,29 - 95 = - μ₀

μ₀ = 88,71

μ₀ = 89

the answer is: d) o, f, and kr.

atomic radius of bromine (br) is 114 pm.

atomic radius of oxygen (o) is 73 pm.

atomic radius of fluorine (f) is 72 pm.

atomic radius of krypron (kr) is 112 pm.

the atomic radius of a chemical element is a measure of the size of its atom.

the atomic radius varies with increasing atomic number, but usually increases because of increasing of number of electrons.

the atomic radius decreases across the periods because an increasing number of protons, because greater attraction between the protons and electrons.

this may not be at all, but i use the same website you're using for school, and if i'm stuck doing one of these i try to look for it on the section.