NationalMediumStatistics7–9

A frequency table records the number of siblings of $20$ pupils: value $1$ with frequency $5$ , value $2$ with frequency $8$ , value $3$ with frequency $4$ and value $4$ with frequency $3$ . What is the mean number of siblings?

Uma tabela de frequências regista o número de irmãos de $20$ alunos: valor $1$ com frequência $5$ , valor $2$ com frequência $8$ , valor $3$ com frequência $4$ e valor $4$ com frequência $3$ . Qual é o número médio de irmãos?

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Solution

Step 1 of 3

1.Each value must be weighted by its frequency: $1(5) + 2(8) + 3(4) + 4(3) = 5 + 16 + 12 + 12 = 45$ .

A frequency table records the number of siblings of 202020 pupils: value 111 with frequency 555, value 222 with frequency 888, value 333 with frequency 444 and value 444 with frequency 333. What is the mean number of siblings?

Answer options

A frequency table records the number of siblings of $20$ pupils: value $1$ with frequency $5$ , value $2$ with frequency $8$ , value $3$ with frequency $4$ and value $4$ with frequency $3$ . What is the mean number of siblings?