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1.There are 30 students in a Grade 7 class. The grades obtained by the students in
Mathematics are tabulated below. Calculate the mean grade. Round off your answers
to two decimal places.

1There Are 30 Students In A Grade 7 Class The Grades Obtained By The Students In Mathematics Are Tabulated Below Calculate The Mean Grade Round Off Your Answers class=

Sagot :

The mean number of the grades obtained by the students in Mathematics is 84,87.

Step-by-step explanation:

The mean is the average of the given collection of data. Mean represent the sum of the value of all the observations divided by the total number of observations.

We can use the following formula for questions of calculating mean:

[tex]Mean= \Sigma\frac{fx.ix}{f}[/tex]

[tex]\Sigma fx=[/tex] Sum of all frequencies

Given: There are 30 students in a Grade 7 class. The grades obtained by the students in Mathematics are tabulated below.

To Find: The mean number of grades obtained by the students.

Solution:

  • We need to calculated the mean grade.

Grades Obtained (x)     Number of Students  (f)                    (fx)

          100                                         2                                    200

           95                                         7                                     665

           88                                        10                                    880

           76                                         6                                     456

           69                                         5                                    345

                                                     Σf = 30                        Σ(fx) = 2546

  • Apply the formula of mean

[tex]Mean= \Sigma\frac{fx.ix}{f}\\[/tex]

          [tex]=\frac{2546}{30}[/tex]

          [tex]=84,86666667[/tex]

          [tex]=84,87[/tex]

Hence, the mean number of the grades obtained by the students in Mathematics is 84,87.

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