Biology Forums - Study Force

A study was conducted to determine whether flipping a penny or spinning a penny has an effect on the proportion of heads. Among 56,126 trials, 25,586 involved flipping pennies, and 12,630 of those pennies turned up heads. The other 30,540 trials involved spinning pennies, and 12,815 of those pennies turned up heads.
(i) What percentage of the trials involved flipping pennies?
(ii) What percentage of the trials involved spinning pennies?
(iii) Among the pennies that were flipped, what is the percentage that turned up heads?
(iv) Among the pennies that were spun, what is the percentage that turned up heads?
Round your answers to the nearest percent.

▸ (i) 46%; (ii) 54%; (iii) 49%; (iv) 42%

▸ (i) 46%; (ii) 54%; (iii) 50%; (iv) 41%

▸ (i) 46%; (ii) 54%; (iii) 170%; (iv) 142%

▸ (i) 54%; (ii) 46%; (iii) 49%; (iv) 42%

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