Lengths 6

Lengths of 130 tubes are measured. The arithmetic mean is 17.27 cm, and the standard deviation is 1.2 cm. How many tubes do have a length:
a) between 16.5 cm and 18.1 cm
b) greater than 17 cm

Correct answer:

a =  64
b =  77

Step-by-step explanation:

m=17.27 cm σ=1.2 cm  n=130  p0 = P(16.5cm<x<18.1cm)  p0=0.4949  a=p0 n=0.4949 130=64

Use the normal distribution table.
p1 = P(x>17cm)  p1=0.589  b=p1 n=0.589 130=77

Use the normal distribution table.

Did you find an error or inaccuracy? Feel free to write us. Thank you!

Tips for related online calculators
Looking for help with calculating arithmetic mean?
Looking for a statistical calculator?
Looking for a standard deviation calculator?

You need to know the following knowledge to solve this word math problem:

Related math problems and questions: