The mean weight of a group of 7 girls is 58kg
work out their total weight with the calculation

Easy.The answer is 406kg.

Step-by-step explanation:

58kg×7=406kg

406kg

Mean = {Sum of Observation} ÷ {Total numbers of Observations}

here : Total numbers of Observations is 7 girls

and mean is 58kg

we can use the formula, 58= sum of observation/7

sum of observation,  total weight = 406kg

answer: option a.

step-by-step explanation:

you know that the quadrilateral opqr ( a four sided figure) is inscribed in circle. this means that all its vertices are on the circle.

then, by definition, the opposite angles of the quadrilateral are supplementary, this means that the sum of their measures is 180 degrees.

you can observe in the figure that the angles ∠opq   and the angle ∠orq   are opposite, therefore:

then, can be used to d to calculate the measure of ∠opq