Chapter 13.5, Problem 33SPR

To determine

To determine probability of given event.

Answer to Problem 33SPR

P(pointer landing on red) $=\frac{1}{4}=0.25$

Explanation of Solution

Given information:

  

Here we have to find P(pointer landing on red)

To determine this we shall find the fraction of angle covered by the red color on the spinner.

Hence the fraction of angle of red color is $\frac{{90}^{\circ }}{{360}^{\circ }}$ (total angle of a circle is ${360}^{\circ }$ )

Now probability of the event will be same as the fraction of red color as total possibilities of rotation of pointer can be 360 (considering for each degree)

Hence,

P(pointer landing on red) $=\frac{90}{360}=\frac{1}{4}=0.25$