Answer to Question #152066 in Statistics and Probability for shn

Question #152066
Weights. If the weights of 600 students are normally distributed with a mean of 50 kilograms and a variance of 16 kilograms
a. Determine the percentage of students with weights lower than 55 kilograms.
b. How many students have weights exceeding 52 kilograms?
1
Expert's answer
2020-12-21T17:29:14-0500

μ=50\mu=50

σ=16\sigma=16

n=600n=600

a) P(X<55)=P(Z<55μσ)=P(Z<555016)=P(Z<0.3125)=0.6217P(X<55)=P(Z<\frac{55-\mu}{\sigma})=P(Z<\frac{55-50}{16})=P(Z<0.3125)=0.6217

wich is 62.17%

b) P(X>52)=P(Z>525016)=P(Z>0.125)=1P(Z<0.125)=P(X>52)=P(Z>\frac{52-50}{16})=P(Z>0.125)=1-P(Z<0.125)=

=10.5478=0.4522=1-0.5478=0.4522

6000.4522=271600\cdot0.4522=271


Answer:

a) 62.17% of students with weights lower than 55 kilograms

b) 271 students have weights exceeding 52 kilograms


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