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brad wonders how much money he has saved in his coin jar. to make it ea…

Question

brad wonders how much money he has saved in his coin jar. to make it easier to find the total amount, he first sorts the coins by type. brad’s coin jar type pennies nickels dimes quarters frequency 125 180 90 105 complete the relative frequency table for the data. brad’s coin jar type pennies nickels dimes quarters relative frequency % % % %

Explanation:

Step1: 计算总硬币数

总硬币数为各类型硬币数量之和,即\(125 + 180 + 90 + 105\)。
\(125 + 180 + 90 + 105 = 500\)

Step2: 计算便士的相对频率

便士的相对频率为便士数量除以总数量再乘以\(100\%\),即\(\frac{125}{500} \times 100\%\)。
\(\frac{125}{500} \times 100\% = 25\%\)

Step3: 计算镍币的相对频率

镍币的相对频率为镍币数量除以总数量再乘以\(100\%\),即\(\frac{180}{500} \times 100\%\)。
\(\frac{180}{500} \times 100\% = 36\%\)

Step4: 计算一角硬币的相对频率

一角硬币的相对频率为一角硬币数量除以总数量再乘以\(100\%\),即\(\frac{90}{500} \times 100\%\)。
\(\frac{90}{500} \times 100\% = 18\%\)

Step5: 计算四分之一美元硬币的相对频率

四分之一美元硬币的相对频率为四分之一美元硬币数量除以总数量再乘以\(100\%\),即\(\frac{105}{500} \times 100\%\)。
\(\frac{105}{500} \times 100\% = 21\%\)

Answer:

便士:\(25\%\),镍币:\(36\%\),一角硬币:\(18\%\),四分之一美元硬币:\(21\%\)