Chapter 6

Question 1

Answer 1

1 over (B-A)
A = 1 B = 3
LL = 1.5, UL = 3

Question 2

Answer 2

(a) Pointing to the area to right thus 1-.3557 = answer on chart
(b) Pointing to the area to the left thus find 0.0367 on chart
(c)(1)Find -0.91 on chart = #
(2)# + .7317 (given area)
(3)Find the added value on chart

Question 3

Answer 3

(a)12 - 15 over 2.5 = -1.2 (look up in chart)
(b)Rearrange formula x=SD(z)+mean
Look up .1922 in chart = num
2.5(num)+15=ans
(c)Same as (b) but sign is greater than so 1-.2206 = num
Look up num in chart and follow as above
(d)like (a) but greater area - smaller area
((16-15)/2.5)-((9-15)/2.5) = num
Look up num in charts

Question 4

Answer 4

1)X is 10% (.1). Find the value closest to .1 in the charts (-1.28)
2)Using the rearranged formula
2500(-1.28)+25000 = ans

Question 5

Answer 5

Continuity correction - LL minus .5, UL plus .5
Coin = probability is 50%
mean = 484 * p, SD = SquareR(484 * p * q)
(a)225-.5-mean/SD = num (find on chart
255+.5-mean/SD = num (find on chart)
UL - LL = ans
(b)249+.5-mean/SD = num(find on chart)
249-.5-mean/SD = num(find on chart)
UL-LL = ans
(c)217<x<270
217-.5-mean/SD = num (find on chart)
270+.5-mean/SD = num (find on chart) –> 1 - num (x<270)
UL + LL = ans

Question 6

Answer 6

Question 7

Answer 7