Baby talk: In a sample of 80 children, the mean age at which they first began to combine words was 16.81 months, with a standard deviation of 9.65 months. Construct a 95% interval for the mean age at which they first begin to combine words. Round the answers to two decimal places.

A 95% confidence interval for the mean age is

How to use order of operation in 20 divide by 4 multiply 5 = 1

Mrs. avila is buying a wallpaper border to go on all of her kitchen walls. she wants to buy 5 extra feet of wallpaper border than she needs to be sure she has enough. she buys 55.5 feet of the border. the store owner selling the border uses the width of mrs. avila's kitchen to determine that the length of her kitchen must be 14.5 feet.

If mary had 320 toy cars and she gave her friend 50 cars and then she gave her brother 72 more cars how much toy cars would mary have left ● explain with proper details