A normal distribution has a mean of 15 and a standard deviation of 4. What percent of values are from 15 to 23

47.72%

Step-by-step explanation:

Given

Mean (u) = 15

SD = 4

P(15<x<23) =

=

=P(0<z< 2)

=P(z<2) - P(z<0)

Use standard normal table to find probability of the z score

= 0.9772 - 0.5

= 0.4772 47.72%

b. 6

step-by-step explanation:

we are given the table representing an exponential function.

we can see from the table that, as x is increasing, the value of y is increasing in the power of 6.

i.e. the following relation is obtained,

x = 1, y = 6

x = 2, y = 36 =

x = 3, y = 216 =

x = 4, y = 1296 =

x = 5, y = 7776 =

so, the geometric series obtained is .

thus, the common ratio is given by = = 6.

hence, the common ratio is 6.

what is

step-by-step explanation: