Astore manager is looking at past jewelry sales to determine what sizes of rings to keep in stock. the list shows the ring sizes purchased by the last ten jewelry customers. 9, 7, 6.5, 7.5, 7, 8, 5, 6, 7.5, 8 what is the variance of the data set? round to the nearest hundredths. 0.40 0.72 1.15 2.14

(C)1.15

Step-by-step explanation:

The given data set is:

9, 7, 6.5, 7.5, 7, 8, 5, 6, 7.5, 8

In order to find the variance of the given data set, firstly find the mean of the data set.

Thus,

Now, Data set                                  

9                                                                          3.422

7                                                                          0.022

6.5                                                                       0.422

7.5                                                                       0.122

7                                                                          0.022

8                                                                          0.722

5                                                                          4.622

6                                                                          1.322

7.5                                                                       0.122

8                                                                          0.722

Now,

Thus, the variance of the given data set is 1.15.

answer: - (a)

(b) 88 seats

step-by-step explanation:

given: in an auditorium, there are 22 seats in the first row and 28 seats in the second row.

thus first term=

second term=

the number of seats in a row continues to increase by 6 with each additional row.

⇒d= 6

a) given formula :

b)   let the number of seats (n) = 12

substitute n=12 in the explicit rule formed in (a)

∴there are 88 seats in 12 rows.

what chart am i supposed to follow?