Aset of data has a normal distribution with a mean of 5.1 and a standard deviation of 0.9. find the percent of data less than 4.2. a) about 16% b) about 34% c) about 50% d) about 13.5%

A) about 16%

Step-by-step explanation:

Given: Mean :

Standard deviation :

We know that , the value of z is given by :-

For x=4.2

The p value =

Hence, about 16 % of data is less than 4.2.

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the largest number of the four options is 1.8 x 10-2

you have it in scientific notation.

1.80 x 10-6   = 0.00000180

1.80 x 10-4   = 0.000180 (bigger, or "less small", than the former one)

so

1.8 x 10-2       = 0.0180. as you see. the "less small", or the biggest one of them all.

as you have negative exponent, it means you are dividing 1.8 by 100 (i.e. moving the dot towards left, two times).

if you had positive exponent for the scientific notation, power of tenths, you would be multiplying times 100 (moving the dot towards right) as below:

1.8 x (10)2 = 180

so. if you have negative exponent in scientific notation, move the dot toward left. if it is positive, toward right as many times the exponent tells you.