The mean radius of the Earth is $6378 km$, to the nearest km. Find upper and lower bounds for the volume of the Earth in $k{m}^3$. Assume that the Earth is a sphere.

Calculate upper and lower bounds for the area of the triangle. The two short sides of a right-angled triangle are $3.7 cm$ (to nearest mm) and $4.5 cm$ (to nearest mm). Give your answers to the nearest cm.

Calculate upper and lower bounds for the length of the hypotenuse. The two short sides of a right-angled triangle are $3.7$cm (to nearest mm) and $4.5$cm (to nearest mm). Give your answers to the nearest cm. 

Calculate upper and lower bounds for $x$.The angles in a triangle are $x°, 38.4°$ (to $1 d.p.$) and $78.1°$ (to $1 d.p.$).

Calculate upper and lower bounds for $x$ as a percentage of $y$ to $1$ decimal place.Quantity $x$ is $45$ to the nearest integer. Quantity $y$ is $98$ to the nearest integer.  

The following five masses are given to $3$ significant figures. Calculate upper and lower bounds for the mean of these masses. 

$138$kg, $94.5$ kg, $1090$ kg ,$345$ kg, $0.354$ kg