The average lifetime of a certain new cell phone is four years. the manufacturer will replace any cell phone failing within 3 years of the date of purchase. the lifetime of these cellphones is known to follow an exponential distribution. what is the decay rate (m)?

The decay rate 'm' is 0.25

Step-by-step explanation:

As given,

Average Life time of New cell phone = 4 years

Lifetime of phone = L = ?

L is a random variable defining lifetime of a cell phone.

L∼ Exponential (m)

Mean of Exponential Distribution =

As, they follow exponential distribution, so to find decay rate , we simply can write it as :

= 4

or

m=0.25

L∼ Exponential (0.25)

The decay rate is 0.25

tube or goog would be a great resource to with that question

the first one is x^2+2x+2

the second one is x^2+4

the last one is x^2-4x+8