On a statistics test the class mean was 63 and the standard deviation was 7and for the biology test the mean was 23 and has a standard deviation of 3.9 mark scored a 38 on the biology exam what is his Z score round two decimal places

step-by-step explanation:

i think it’s a i believe

1) the property is   ixi = a ⇔x = a   o x = -a

4(x-5)+3= 15⇒4x-20+3 = 15⇒4x-17= 15⇒4x = 15+17⇒4x = 32⇒x =32/4= 8

4(x-5) +3= -15⇒4x-20 +3 = -15⇒4x-17= -15⇒4x =-15+17⇒4x = 2⇒x =2/4= 1/2

the values are x =8 and x = 0,5