Answer:
Z = 3
Step-by-step explanation:
In a normal distribution, the Z score that corresponds with a data point x is calculated using the formula;

For the case given, the z score will be;

Answer:
it's 4.5
Step-by-step explanation:
you have to find the difference between each number and the mean. then you find the mean of that sum
Answer:
a + 3
Step-by-step explanation:
Kim's age is always three more than Tom's age.
Answer: score if the sixth pupil is 90
Step-by-step explanation:
Mean mark-75.5
6pupil
83+73+71+67+69+x= 75.5
363+x=75.5×6
×=453-363
×=90
Answer: 30 square inches.
Step-by-step explanation: Take the equation, V=(1/3)AH
For V=Volume, A=Area of base, and H=equals the height of the triangular pyramid.
We know the area of the base is 9, and the height is 10. So, multiply 10x9. You get 90.
Now, to get the v, you divide 90 by 3 to get 30. V=30.