Question

(cm) and standard deviation 21 cm. Use the 68-95-99.rue to answer the The upper arm length of females over 20 years old in a country is approximately Normal with following questions (Enter your answers to one decimal place) (a) Wat range of length covers almost all (99.7%) of this distribution From cm to (1) what percent of women over 20 have upper arm lengths less th

Answer 1

CASAMA Here mean = u = 35.9 standard deviation r = 2.1 According to 68-95-aq. f zule, Approximately 99.7 4. area lies between 3 standard deviations 4 or the means a): Lower limit= - 3t Lower limit = 29. 6 = 35.9 - (3) "ca 7 Upper limit = opper at3*5= 35.9+(3)* (2.1) limit = 42.2 . from 129.61 cm to 42.2 cm b) p(x < 33.8) = P(x - 4 - 38.8 - " ) 33.8 - 35.9 1 = - P(26-1) p(za 1) AS z is symetic us a-table = 1-0.8413 (x< 33.8) = 0.1587 L Ex2338) - fone decimal face) 1. we than Approximately 30t. 15.91 of worsen 20 have opper arm lengths less 33.8 cm.