The set of life spans of an appliance is normally distributed with a mean mc012-1.jpg = 48 months and a standard deviation mc012-2.jpg = 8 months. what is the z-score of an appliance that stopped working at 64 months?

The z-score of an appliance that stopped working at 64 months is 2

Step-by-step explanation:

We know that,

where,

Z = Z score,

X = raw score = 64

μ = mean = 48

σ = standard deviation = 8

Putting the values,

Therefore, the z-score of an appliance that stopped working at 64 months is 2.

38.5

step-by-step explanation:

lets say, first number = r

second number = 3r+7

total = 49

(r)+(3r+7)= 49

4r+7 = 49

4r = 42

r = 42/4

r= 10.5

3r+7 = 3(10.5)+7 = 38.5

hope this

2/5

step-by-step explanation: