Answer:
a) 0.7734
Step-by-step explanation:
Problems of normal distributions can be solved using the z-score formula.
In a set with mean
and standard deviation
, the zscore of a measure X is given by:

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.
In this question, we have that:

(a) what proportion of children aged 13 to 15 years old have scores on this test above 83 ?
This is 1 subtracted by the pvalue of Z when X = 83. So



has a pvalue of 0.2266
1 - 0.2266 = 0.7734
The answer is 0.7734
Answer:
4:7
Step-by-step explanation:
4 grape candies : 7 total candies (grape + cherry)
Answer:
36
Step-by-step explanation:
6^2 = 6 × 6
----------------
6×6 = 36
Answer:
A. 4 in.
Step-by-step explanation:
= 3 +
22 = 2 + 2[3 + ] ↷
22 = 2 + 6 + 2
22 = 6 + 4
- 6 -6
-------------
16 = 4
4 =
I am joyous to assist you anytime.
Answer:
D. 4x-13=1
Step-by-step explanation:
Four times a number is 4x. 13 less means you subtract 13 from it.