The amount of time a certain brand of light bulb lasts is normally distributed with a

mean of 1400 hours and a standard deviation of 85 hours. What percentage light

bulbs last between 1310 hours and 1470 hours, to the nearest tenth?

arithmetic sequence

step-by-step explanation:

given that a sequence has terms as

19, 15, 11,

this is represented on a graph

the pattern indicates that the sequence is an arithmetic sequence with i term

a=19 and common difference d =-4

any general term

thus the sequence is reduced by 4 for each successive term starting from 1 and nth term is

24-5n.

first negative term would start after 5th term

5th term =24-25< 0

from 5th term onwards the sequence would be negative.

the answer is c

hope this !

d

step-by-step explanation: