The sexes and ages of a random sample of 300 runners taking part in marathons are classified as follows in the table below. Table: Sexes and ages of runners taking part in marathons. Sex Observed Row totals Male Female Under 40 70 54 124 Age group 40-49 76 36 112 50 and over 52 12 64 Column totals 198 102 300 What is the expected frequency of a female runner between the ages 40-49?

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