Find the value za/2 needed to constrict a confident interval with level 87%

The value za/2 needed to constrict a confident interval with level 87% is 1.51

Step-by-step explanation:

At 87% confidence level the z is ,  

α= 1 - 87%

  = 1 - 0.87

   = 0.13

α/ 2 = 0.13 / 2

        = 0.065

Zα/2 = Z0.065

        = 1.51 ( Using z table )

center= (-2,0)

radius= sqrt2/2

step-by-step explanation:

12cm

the answer is d