Find the mean of the data summarized in the given frequency distribution. 1) The manager of a bank recorded the amount of time each customer spent waiting in line during pea 1)
business hours one Monday. The frequency distribution below summarizes the results. Find the me
waiting time. Round your answer to one decimal place.
Waiting time Number of
(minutes) customers
0-3
9
4-7
11
8 - 11
13
12 - 15
5
16 - 19
7
20-23
3
24 - 27
1
A) 9.9 min
B) 7.0 min
C) 13.5 min
D) 9.7 min

go on the tube you might find some information there

step-by-step explanation: so we look at the formula un = a + (n-1)d

un is the amount of seats

n is the nth term aka row number

a is the original sequence/row number

d is the difference between each term

so in this a=22 d=6 and n can remain as n because we are simply formjng a rule

lets put these in the equation

un=22+(n-1)(6)

this is your answer to part a

however

lets double check that this is correct, we'll try putting it into the second term

un=a+(n-1)d

u2=22+(2-1)(6)

u2=22+6

u2=28

as the question said the second row has 28 seats so now we know the formula we made is correct.

as for part b

un=a+(n-1)

its asking us to find a row with 100 seats.

remember un was the amount of seata so all we do is substitute this in.

un=100 a=22 d=6

un=a+(n-1)d

100=22+(n-1)(6)

so now we simplify to find n which is the row number.

100-22=22+(n-1)(6)-22

78=(n-1)(6)

78/6=(n-1)(6)/6

13=n-1

13+1=n-1+1

14=n

so now we know that in the 14th row there is 100 seats.

hope this and that you understood! its my first time using the app or anyone out on here : p its also me to revise so a bunch! ask more questions if you dont understand ☺