10km race

Joan's finishing time for the bolder boulder 10 km race was 1.77 standard deviations faster than the women in her age group. 415 women ran in her age group. Assuming a normal distribution, how many women ran more quickly than Joan?

Correct answer:

x =  15

Step-by-step explanation:

z = 1.77 σ w=415  n=0.4616  r=0.500.4616=0.0384  x1=r w=0.0384 415=1251992=15125117=15.936  x=x1=15.936=15

Use the normal distribution table.

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