Question

Let x = red blood cell (RBC) count in millions per cubic millimeter of whole blood. For healthy females, x has an approximately normal distribution with mean μ = 3.4 and standard deviation σ = 0.7.

(a) Convert the x interval, 4.5 < x, to a z interval. (Round your answer to two decimal places.)
< z

(b) Convert the x interval, x < 4.2, to a z interval. (Round your answer to two decimal places.)
z <

(c) Convert the x interval, 4.0 < x < 5.5, to a z interval. (Round your answers to two decimal places.)
< z <

(d) Convert the z interval, z < −1.44, to an x interval. (Round your answer to one decimal place.)
x <

(e) Convert the z interval, 1.28 < z, to an x interval. (Round your answer to one decimal place.)
< x

(f) Convert the z interval, −2.25 < z < −1.00, to an x interval. (Round your answers to one decimal place.)
< x <

(g) If a female had an RBC count of 5.9 or higher, would that be considered unusually high? Explain using z values.

Yes. A z score of 3.57 implies that this RBC is unusually high.

No. A z score of −3.57 implies that this RBC is unusually low.    

No. A z score of 3.57 implies that this RBC is normal.

Answer 1

Sot Giver mean, 3. 1dard devi ation, o X-O3-4 tollows Slandard Norma 0-7 4.-3.4 s71428 22 4.2-3-4 7근 근< 1-1428 5구 근스 1.4 2 c2 4-O 4.0-3.4 S.5-3-4 O7 hlt S8.0 O8622 3

Z2-1-4Y L-3.4 -1-44 3-4-10ot or XLN-392 x 2-39 e) 1- 28 L 2 X-3-4 0 891 t3-4 4-296 X 2.254 2-100 2-1.00 -1-5ast3-42 X -O743 1825 L2.7 7 8 ex22.7 .9-2.9 3.571428 S RBC unusually hit. Ye A score o 3.57 implien 1t