rowan sells a dress for $42.60 after making a profit of 20% on the cost price. calculate the cost price.

35.5

Step-by-step explanation:

let the cost be X

if 120% is 42.60

then how much is 100%

X=42.60*100/120

X=35.5

the mean and the standard deviation is 0.92 and 0.01808 respectively

Step-by-step explanation:

The computation of the mean and the standard deviation is shown below:

The mean is 0.92

And, the standard deviation is

= √0.92 × (1 - 0.92) ÷ √225

= √0.92 × 0.08 ÷ √225

= √0.0736 ÷ √225

= √3.27

= 0.01808

Hence, the mean and the standard deviation is 0.92 and 0.01808 respectively