A set of average city temperatures in October are normally distributed with a mean of 20.6 degrees Celsius and a standard deviation of 2 degrees Celsius. What proportion of temperatures are between 18 degrees Celsius and 20 degrees Celsius?

, and

for

step-by-step explanation:

we can analyze the pattern at which the terms increase. let us denote , , , so that we can call

note the following:

the pattern: to get the next term value, we just add the next term number (e.g. 1st, 2nd, to the previous term value (term values are the given numbers in the question, 1, 3, 6, 10, 15,

from , to get to , we add

from , to get to , we add

etc.

we need to form a recursive formula, a formula that has the next term as a function of the previous term. so a possible recursive formula can be

, and for

answe: it will take 4.5 hours for naomi and clair to paint an equal number of square feet

hope i

-lavira : )