The average age of team managers is 35 years. Assume the variable is normally distributed. If the standard deviation is 5 years, find the probability that the age of a randomly selected team manager will be in the range between 25 and 40 years old.
Solution:
Step 1: Draw a figure and represent the area.
Step 2: Find the z value.
Step 3: Find the appropriate area.
"\\mu=35 \\\\\n\\sigma= 5 \\\\\nP(25<X<40) = P(X<40) -P(X<25) \\\\\n=P(Z< \\frac{40-35}{5}) -P(Z< \\frac{25-35}{5}) \\\\\n= P(Z< 1) -P(Z< -2) \\\\\n= 0.8413 -0.0227 \\\\\n= 0.8186"
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